Tag Archives: 2014

Visions of a Total Lunar Eclipse within clouds

DP ENGLISH: This story belongs to the series “Double Post” which indicates posts that have been written both in English in The Lined Wolf and in Spanish in El Lobo Rayado.

DP ESPAÑOL: Esta historia entra en la categoría “Doble Post” donde indico artículos que han sido escritos tanto en español en El Lobo Rayado como en inglés en The Lined Wolf.

Last night half of the world (Eastern Asia, Australasia, Pacific and the Americas) enjoyed a total lunar eclipse. Again clouds were moving around over Sydney during all the day, I actually see the moon rising in the evening and in just few minutes moving into the clouds. The sky was almost completely covered when the eclipse started, at around 20:15 local time. I was fearing that, as it happened with the partial solar eclipse visible in Sydney last 29th April, I would not be able to get any useful image of the eclipse.

In any case, as I did for the occultation of Saturn by the Moon last May, I set up my telescope in the backyard and prepared everything for taking some photos of the event. Although I followed the eclipse almost completely, the clouds only allowed me to get good images in three occasions. These are the results:

Visions of a Total Lunar Eclipse within clouds.
8 October 2014 from Sydney. Data obtained using Telescope Skywatcher Black Diamond D = 80 mm, f = 600 mm, with a CANON EOS 600D at primary focus. The Red Moon compiles 40 frames taken at 1/3 s & ISO 800. Stacking using Lynkeos software, final processing with Photoshop. Credit: Á.R.L-S. (AAO/MQ)


It is not too much but I hope you like it. I will wait for the next total lunar eclipse to try to get the time-lapse sequence of all the event.

Advertisements

Dissecting galaxies of the Local Universe with the CALIFA survey

DP ENGLISH: This story belongs to the series “Double Post” which indicates posts that have been written both in English in The Lined Wolf and in Spanish in El Lobo Rayado.

DP ESPAÑOL: Esta historia entra en la categoría “Doble Post” donde indico artículos que han sido escritos tanto en español en El Lobo Rayado como en inglés en The Lined Wolf.

The Calar Alto Legacy Integral Field spectroscopy Area (CALIFA) survey is a project that aims to obtain data of around 600 nearby galaxies using the PMAS (Potsdam Multi Aperture Spectrophotometer) instrument of the 3.5m Telescope at the Calar Alto Observatory (Almería, Spain). The CALIFA survey combines the advantages of two observational techniques: imaging (that provides detailed information on galactic structure) and spectroscopy (that reveals the physical properties of galaxies, such as their kinematics, mass, chemical composition or age). The CALIFA survey makes use of the Integral Field Spectroscopy (IFS) technique, that allows obtaining at the same time around a thousand of spectra per galaxy, hence getting simultaneously imaging and spectra of astronomical objects.

A galaxy is “dissected” in thousands small regions, each one having its particular spectrum (wavelength) when using Integral Field Spectroscopy (IFS) techniques. The result is getting a datacube: two axes (x and y) possess the spatial information (the image of the galaxy, which can also be separated in several colours) and the third axis (wavelength) keep the spectroscopic information. Credit: Marc White (RSAA-ANU).

The CALIFA Project allows not only to inspect the galaxies in detail, but it also provides with data on the evolution of each particular galaxy with time: how much gas and when was it converted into stars along each phase of the galaxy’s life, and how did each region of the galaxies evolve along the more than ten thousand million years of cosmic evolution

Thanks to these data, astronomers of the CALIFA team have been able to deduce the history of the mass, luminosity and chemical evolution of the CALIFA sample of galaxies, and thus they have found that more massive galaxies grow faster than less massive ones, and that they form their central regions before the external ones (inside-out mass assembly). CALIFA has also shed light on how chemical elements needed for file are produced within the galaxies or on the physical processes involved on galactic collisions, and it has even observed the last generation of stars still in their birth cocoon.

CALIFA “panoramic view” (also CALIFA’s “Mandala”) representation, consisting of the basic physical properties (all of them derived from the CALIFA datacubes) of a subsample of 169 galaxies extracted randomly from the 2nd Data Release. It shows 1) broad band images (top center), 2) stellar mass surface densities (upper right), 3) ages (lower right), 4) narrow band images (bottom center; emission lines: Hα [N II] 6584 Å, and [O III] 5007 Å), 5) Hα emission (lower left) and 6) Hα kinematics (upper left). The CALIFA logo is placed at the central hexagon. Credit: R. García-Benito, F. Rosales-Ortega, E. Pérez, C.J. Walcher, S. F. Sánchez & the CALIFA team.

Today, Oct 1st, the CALIFA Team (and I’m part of it) has released 400 IFS datacubes for 200 nearby galaxies, the 2nd Data Release (DR2). The data are publically available and can now be used by astronomers around the world. The second CALIFA Data Release provides the fully reduced and quality control tested datacubes of 200 objects in two different spectral configurations. Each datacube contains ~1000 independent spectra, thus in total the CALIFA DR2 comprises ~400,000 independent spectra (~1.5 millon after cube reconstruction). The scientific details of the data included in the CALIFA DR2 are described in this scientific paper lead by the Spanish astronomer Rubén García-Benito.

More information about the CALIFA survey and its DR2:

– Calar Alto Observatory Press Release: http://www.caha.es/an-unprecedented-view-of-two-hundred-galaxies-of-the-local-universe.html

– Scientific paper about CALIFA DR2: García-Benito et al. (2014): http://arxiv.org/abs/1409.8302

– CALIFA webpage: http://www.caha.es/CALIFA/public_html

– CALIFA DR2 webpage: http://califa.caha.es/DR2

Time-lapse: The Sky over Siding Spring Observatory

DP ENGLISH: This story belongs to the series “Double Post” which indicates posts that have been written both in English in The Lined Wolf and in Spanish in El Lobo Rayado.

DP ESPAÑOL: Esta historia entra en la categoría “Doble Post” donde indico artículos que han sido escritos tanto en español en El Lobo Rayado como en inglés en The Lined Wolf.

I’ve been waiting year and a half to finally see this happening. One of the displays I prepared for the Stories from Siding Spring Observatory Photo Exhibition (that was organized by staff of the Australian Astronomical Observatory (AAO) and originally released on 17th April 2013 at the Sydney Observatory), was a new time-lapse video compiling scenes showing all the telescopes at the Siding Spring Observatory (Coonabarabran, NSW, Australia) before the terrible bushfires that destroyed the Warrumbungle National Park and seriously affected the very same Observatory on 13th January 2013. However I couldn’t do this time-lapse video public until today, as it is the very first video to be included in the AAO Youtube channel. So here it is the time-lapse video “The Sky over Siding Spring Observatory:

Video time-lapse The Sky over Siding Spring Observatory. To enjoy it as its best, I strongly recommend you to see it at its highest resolution (FullHD) and full screen in a dark room. Credit: Video Credit: Ángel R. López-Sanchez (AAO/MQ), Music: Point of no return (Rogert Subirana).

I think this is the best time-lapse video I have created so far. It last 4:30 minutes and it compiles the best time-lapse sequences I obtained at Siding Spring Observatory between August 2011 and March 2013, during my support astronomer duties for the 4-metre Anglo-Australian Telescope (AAT). Telescopes at Siding Spring Observatory featured include the Uppsala Near Earth Object Survey Telescope, the UNSW Automated Patrol Telescope, the 2.3m ANU Telescope, 1.2m Skymapper ANU, the 1.2m UK Schmidt Telescope (AAO) and the very own Anglo-Australian Telescope (AAT).

Throughout the video, watch for several astronomical objects: our Milky Way Galaxy, the Large and Small Magellanic Clouds, the Moon rising and setting, the planets Venus, Mars, Jupiter and Saturn, Zodiacal Light, Earth-orbiting satellites, airplanes crossing the sky, the Pleiades and Hyades star clusters, the Coalsack and the Carina nebulae, and famous constellations like the Southern Cross, Taurus, Orion, and Scorpio.

The time-lapse technique consists of taking many images and then adding all to get a movie with a very high resolution. In particular, the camera CANON EOS 600D and two lenses (a 10-20 mm wide-angle lens and a standard 35-80 mm lens) were used to get the frames of this time-lapse video. Except for those frames taken during the sunset in the first scene, frames usually have a 30 seconds exposure time, with a ISO speed of 1600. Some few scenes were shot using 15 or 20 seconds exposure time. All sequences were created at 24 fps (frames per second), and hence a second in the movie corresponds to 12 minutes in real time for the majority of the scenes. In total, the video combines around 5800 individual frames. Processing each 10 – 20 seconds sequence took between five and six hours of computer time. Care was taken to remove artifacts and hot pixels from individual frames, minimize background noise, and get an appropriate colour/contrast balance.

I hope you like it. Comments and posting about it in social media are very welcome.

More information and previous time-lapses

Video in the AAO YouTube Channel.

AAO Webpage: Timelapse Video: The Sky Over Siding Spring Observatory (25th Sep 2014)

Timelapse video: The Sky over the Anglo-Australian Telescope (3rd May 2013).

Timelapse video: A 2dF night at the Anglo-Australian Telescope (7th May 2014).

Seasons: Astronomy vs. Australia

Something that really shocked me when I started to live in Australia ~7 years ago was to hear everywhere that seasons start at the beginning of the corresponding month. That is, as today is Sep 1st, everyone in the radio / advertisements / news is welcoming Spring. And this, being an astronomer, believe me, hurts. Why? Because astronomically we are still in winter. Seasons are defined by Astronomy in a very accurate and precise way. This year Spring starts on September 23rd, 11:29 AEST (02:29 Universal Time). That is when that the Autumn Equinox happens, and the real moment Spring starts in the Southern Hemisphere (and Autumn/Fall starts in the Northern Hemisphere).

The seasons are caused by the combination of three astronomical factors: the Earth’s is a (almost perfect) sphere, the Earth’s orbit around the Sun, and the Earth’s axial tilt. As a consequence of these the Earth’s atmosphere is unequally heated by the Sun around the year at a given position. Therefore, the seasons are marked by the movement of the Earth around the Sun and, hence, which way the Earth is tilted with respect to the Sun. When the South hemisphere is tilted towards the Sun, the Sun’s rays strike the Earth at a steeper angle compared to a similar latitude in the North hemisphere. As a result, the radiation is distributed over an area which is less in the South hemisphere than in the North hemisphere. This means that there is more radiation per area to be absorbed in the South hemisphere, and therefore it is winter in the North hemisphere and summer in the South hemisphere.

Illumination of Earth by Sun at the southern solstice. Credit: Wikipedia


By astronomical definition, the precise timing of the seasons is determined by the exact times of transit of the Sun over the tropics of Cancer and Capricorn for the solstices and the times of the Sun’s transit over the Equator for the equinoxes, as specified in this figure:

Movement of the Earth around the Sun following an orbital ellipse (with eccentricity exaggerated for effect) and seasons. Equinoxes (20 or 21st March and 22nd or 23rd September) happen when the tilt of Earth’s axis neither inclines away from nor towards the Sun (green dotted line), and hence two points a the same latitude but a different hemispheres receive the same amount of energy from the Sun. In an equinox, the Sun is found at the zenith at the midday at the Equator. A solstice (20th or 21st June and 21st or 22nd December) happens when the tilt of the Earth’s axis has maximum effect (23.44º, red dotted line). At the June solstice the Sun is found at the zenith at the midday (just over our head!) at latitude 23.44º North, defining the Tropic of Cancer. Similarly at the December solstice this happens at 23.44º South, known as the Tropic of Capricorn. The periapsis (perihelion) and the apoapsis (aphelion) mark the nearest and the farthest points from the Sun, respectively (blue dotted line). Credit: Wikipedia


Therefore, in the South hemisphere, Spring starts with the Autumn Equinox, Summer with the Winter Solstice, Autumn with the Spring Equinox and Winter with the Summer Solstice. Of course, the names were given as correct for the North hemisphere.

Well, at least all of this is what Astronomy says. However, Governments and societies quite often decide to use their own definitions. Just checking this webpage of the Australian Bureau of Meteorology:

In Australia, the seasons are defined by grouping the calendar months in the following way:

1. Spring – the three transition months September, October and November.
2. Summer – the three hottest months December, January and February.
3. Autumn – the transition months March, April and May.
4. Winter – the three coldest months June, July and August.

These definitions reflect the lag in heating and cooling as the sun appears to move southward and northward across the equator. They are also useful for compiling and presenting climate-based statistics on time scales such as months and seasons.

Following these assumptions, Australia indeed enters in Spring today, which is funny because the majority of the countries (if not all) of the North hemisphere are still in Summer. In any case, for me it is Winter, and it will be winter till next on September 23rd, 11:29 AEST, when Spring, according to Astronomy, really starts.

Sequence of the occultation of Saturn by the Moon

DP ENGLISH: This story belongs to the series “Double Post” which indicates posts that have been written both in English in The Lined Wolf and in Spanish in El Lobo Rayado.

DP ESPAÑOL: Esta historia entra en la categoría “Doble Post” donde indico artículos que han sido escritos tanto en español en El Lobo Rayado como en inglés en The Lined Wolf.

Today Sunday I’ve used some of my free time to process the images I took last Wednesday, when Saturn was occulted by an almost full Moon. These are my two final images showing how Saturn first disappears behind the Moon and it reappears an hour later.

The Moon occults Saturn I: Saturn disappears.
14 May 2014 from Sydney. Data obtained using Telescope Skywatcher Black Diamond D = 80 mm, f = 600 mm, 20 mm eyepiece + CANON EOS 600D. All times are given in Universal Time, add 10 hours to get the local time in Sydney (AEST) that date. Images of Saturn obtained combining many frames at 1/60 and 1600 ISO using Lynkeos software + Photoshop. Image of the Moon obtained combining 20 best frames using Photoshop. Credit: Á.R.L-S. (AAO/MQ)


The Moon occults Saturn I: Saturn disappears.
14 May 2014 from Sydney. Data obtained using Telescope Skywatcher Black Diamond D = 80 mm, f = 600 mm, 20 mm eyepiece + CANON EOS 600D. All times are given in Universal Time, add 10 hours to get the local time in Sydney (AEST) that date. Images of Saturn obtained combining many frames at 1/100 and 1600 ISO using Lynkeos software + Photoshop. Image of the Moon obtained combining 11 best frames using Photoshop. Credit: Á.R.L-S. (AAO/MQ)

Getting nice images of Saturn was much trickier than I expected: the setup I used the other night it is not the best to observe Saturn, as more magnification and a good tracking are needed. On the other hand, the Moon was very bright so I had to use short exposition times, and hence Saturn appeared very dim. At the end I manage to get a kind of “master Saturn” combining the best frames I took during the night and later combine it with the data of each position to get the final view of Saturn at each time. For the Moon it was much easier, although you’ll perhaps realize that the second image is somewhat better than the first. The reason is that some parts of the Moon were actually saturated with the 1/60 seconds exposures, and that is why I later used 1/100 seconds for getting Saturn reappearing. In any case, I hope you like them.

Occultation of Saturn by the Moon

Today, 14th May 2014, Saturn is occulted by the Moon, although this can only be seen from most Australia and New Zealand. I’ve set up my telescope in the backyard and now I’m taking some photos of the event. Although I’ll try to get better images later, let me show you what I’m obtaining now.

These three images show how Saturn is moving closer to the Moon:

Occultation of Saturn by the Moon, as observed from my backyard in Sydney. I used my Skywatcher Black Diamond Telescope D = 80 mm, f = 600 mm and my CANON EOS 600D, and a 20mm eyepiece projection, at 1600 ISO and speed 1/60. This is just a single frame obtained at 20:44 AEST (10:44 UT). I also used Photoshop to play with the levels/colours/saturation. Credit: Angel R. López-Sánchez.

Occultation of Saturn by the Moon, as observed from my backyard in Sydney. I used my Skywatcher Black Diamond Telescope D = 80 mm, f = 600 mm and my CANON EOS 600D, and a 20mm eyepiece projection, at 1600 ISO and speed 1/60. This is just a single frame obtained at 21:12 AEST (11:12 UT). I also used Photoshop to play with the levels/colours/saturation. Credit: Angel R. López-Sánchez.

Occultation of Saturn by the Moon, as observed from my backyard in Sydney. I used my Skywatcher Black Diamond Telescope D = 80 mm, f = 600 mm and my CANON EOS 600D, and a 20mm eyepiece projection, at 1600 ISO and speed 1/60. This is just a single frame obtained at 21:18 AEST (11:18 UT), the planet is “touching” the disc of the Moon. I also used Photoshop to play with the levels/colours/saturation. Credit: Angel R. López-Sánchez.

After that, I waited for 40 minutes to see Saturn reappears behind the Moon, as it is shown is the next three photos:

Occultation of Saturn by the Moon, as observed from my backyard in Sydney. I used my Skywatcher Black Diamond Telescope D = 80 mm, f = 600 mm and my CANON EOS 600D, and a 20mm eyepiece projection, at 1600 ISO and speed 1/100. This is just a single frame obtained at 21:59 AEST (11:59 UT). I also used Photoshop to play with the levels/colours/saturation. Credit: Angel R. López-Sánchez.

Occultation of Saturn by the Moon, as observed from my backyard in Sydney. I used my Skywatcher Black Diamond Telescope D = 80 mm, f = 600 mm and my CANON EOS 600D, and a 20mm eyepiece projection, at 1600 ISO and speed 1/100. This is just a single frame obtained at 22:05 AEST (12:05 UT). I also used Photoshop to play with the levels/colours/saturation. Credit: Angel R. López-Sánchez.

Occultation of Saturn by the Moon, as observed from my backyard in Sydney. I used my Skywatcher Black Diamond Telescope D = 80 mm, f = 600 mm and my CANON EOS 600D, and a 20mm eyepiece projection, at 1600 ISO and speed 1/100. This is just a single frame obtained at 22:15 AEST (12:15 UT). I also used Photoshop to play with the levels/colours/saturation. Credit: Angel R. López-Sánchez.

In the next few days I’ll prepare some few better (processed) images. Stay tuned!

First “AAO Guerrilla Astronomy” event: partial solar eclipse on 29 April 2014 over Sydney Harbour

Last Tuesday 29th April the Earth, the Moon, and the Sun aligned to produce one of the most spectacular astronomical phenomena we can see: a solar eclipse. The 29th April solar eclipse was actually not a total eclipse (i.e., the disc of the Moon didn’t cover all the disc of the Sun) but an Annular eclipse. The annular phase could be only visible in Antarctica, but a partial solar eclipse was seen throughout Australia in the late afternoon. More information about this solar eclipse can be found in the NASA Eclipse Website managed by the astrophysicist Fred Espenak.

The Sun would be eclipsed by the Moon during the sunset, it was then a perfect opportunity to get some nice photos of the eclipsed Sun with some famous buildings such the Sydney Opera House or Sydney Harbour Bridge. With this excuse, but also with the idea of showing the wonders of Nature to the public, a group of astrophysicists working at Australian Astronomical Observatory (AAO) decided use this solar eclipse to organize our first “Guerrilla Astronomy” event (*). The aim of these activities is to set up amateur telescopes in a public area (a park or a shopping center) and explain to the public who is around what Astronomy is, what astronomers do, and what the “Australian Astronomical Observatory” is. More of these events are coming in the future, but this was our first “test” to see how we can organize and manage the activity.


Participants to the first AAO “Guerrilla Astronomy” Event. From right to left, Stuart Ryder (AAO/AusGO), Kyler Kuehn (AAO), Paola Oliva-Altamiro (Swinburne/AAO) and Ángel R. López-Sánchez (AAO/MQ). The laptop shows the only good image we could get of the eclipse using my telescope. Mrs Macquarie Chair, Sydney Botanic Gardens / Domain, 29 Apr 2014.
Photo Credit: Stuart Ryder (AAO/AusGO).

Given the time and position of the Sun during the eclipse, we decided that a really nice spot to prepare our telescopes would be Mrs Macquarie Chair point, in the Domain, Sydney Botanic Gardens. From there a very dramatic view of the Sydney Opera House and the Sydney Harbour Bridge is seen. We first requested permission to do this to the authorities of the Domain, who were really nice and even allowed us to park by free. Actually, they also came along to see the eclipse and they liked our idea of organizing more “Guerrilla Astronomy” events there in the nearby future.


All set up for eclipse: two telescopes (Stuart’s at the right, mine at the left), the AAO banner, my laptop and camera to take photos through the telescope, the eclipse glasses and extra information about the eclipse to give to the visitors. Mrs Macquarie Chair, Sydney Botanic Gardens / Domain, 29 Apr 2014.
Photo Credit: Ángel R. López-Sánchez (AAO/MQ).

It was four of us, Stuart Ryder (AAO/AusGO), Kyler Kuehn (AAO), Paola Oliva-Altamiro (Swinburne/AAO) and myself, who participated in this first “Guerrilla Astronomy” event. Just to have everything ready on time, we were setting up telescopes, AAO banner and laptop around an hour before the beginning of the eclipse. The weather seemed very clear in the morning, but in the afternoon, as we feared, some clouds started to arrive from the west. We already knew this would be a killer… but we had to try!


Kyler and visitor using the solar glasses. First AAO “Guerrilla Astronomy” Event: partial solar eclipse on 29 April 2014 over Sydney Harbour. Mrs Macquarie Chair, Sydney Botanic Gardens / Domain.
Photo Credit: Paola Oliva-Altamiro (Swinburne/AAO).


Little girl using the eclipse glasses. First AAO “Guerrilla Astronomy” Event: partial solar eclipse on 29 April 2014 over Sydney Harbour. Mrs Macquarie Chair, Sydney Botanic Gardens / Domain.
Photo Credit: Paola Oliva-Altamiro (Swinburne/AAO).


Visitors, but clouds please go away! First AAO “Guerrilla Astronomy” Event: partial solar eclipse on 29 April 2014 over Sydney Harbour. Mrs Macquarie Chair, Sydney Botanic Gardens / Domain.
Photo Credit: Paola Oliva-Altamiro (Swinburne/AAO).

We actually were a bit lucky at the beginning, and hence we could see the Sun within thin clouds and follow the eclipse for 10 minutes. I even could take a nice image:


Partial Solar Eclipse from Sydney on 29 Apr 2014. Telescope Skywatcher Black Diamond D = 80 mm, f = 600 mm + CANON EOS 600D at primary focus + Solar filter. Just 1 frame at ISO 400, 1/8 s, colour processing using Photoshop. 29 April 2014 @ 16:20 AEST ( 06:20 UT ). First AAO “Guerrilla Astronomy” Event: partial solar eclipse on 29 April 2014 over Sydney Harbour. Mrs Macquarie Chair, Sydney Botanic Gardens / Domain.
Photo Credit: Ángel R. López-Sánchez (AAO/MQ).

After that, thick clouds arrived and this happened:

5-seconds timelapse video obtained combining 25 images taken with Telescope Skywatcher Black Diamond D = 80 mm, f = 600 mm + CANON EOS 600D at primary focus + Solar filter, at ISO 400, 1/8 s, showing how the clouds completly cover the eclipsed sun. 29 April 2014 @ 16:20 AEST ( 06:20 UT ). The direct link to the YouTube video is here.
Credit: Ángel R. López-Sánchez (AAO/MQ).

Once the Sun was completely covered by thick clouds we just waited and hoped for a little gap, but unfortunately this never happened and we didn’t see the Sun again that day.


Stuart and his telescope, Kyler and visitors, all hoping the clouds go away. First AAO “Guerrilla Astronomy” Event: partial solar eclipse on 29 April 2014 over Sydney Harbour. Mrs Macquarie Chair, Sydney Botanic Gardens / Domain.
Photo Credit: Paola Oliva-Altamiro (Swinburne/AAO).


The eclipsed sun is setting behind those think clouds. First AAO “Guerrilla Astronomy” Event: partial solar eclipse on 29 April 2014 over Sydney Harbour. Mrs Macquarie Chair, Sydney Botanic Gardens / Domain.
Photo Credit: Ángel R. López-Sánchez (AAO/MQ).

Well, it would have been really nice to see the eclipsed sun setting over the Sydney Harbour Bridge and sinking later close to the Sydney Opera House, I’m sure the images and time-lapse video would have been quite spectacular, but the best I got was this image:


An eclipsed sun should be setting around there… Imagen taken using a Telescope Skywatcher Black Diamond D = 80 mm, f = 600 mm + CANON EOS 600D at primary focus. First AAO “Guerrilla Astronomy” Event: partial solar eclipse on 29 April 2014 over Sydney Harbour. Mrs Macquarie Chair, Sydney Botanic Gardens / Domain.
Photo Credit: Ángel R. López-Sánchez (AAO/MQ).

In any case, all four AAO participants were very happy about how the event was and, as I said, we are expecting to repeat these “Guerrilla Astronomy” activities in the nearby future.

Next solar eclipse to touch Australia will be on 9 March 2016, but it will also be a partial eclipse only visible on the northern and western parts of the continent. The next total eclipse to be seen from Australia will happen on 20 April 2023 and it will just touch the coast of Western Australia. We have to wait until 22 July 2028 to see a total solar eclipse in Sydney. Actually, Sydney is almost exactly in the center of the totality.

More photos of this event can be found in this Flickr Album.

(*) Note that the word “Guerrilla” comes from Spanish, however the name didn’t come from me but from an idea my colleague Amanda Bauer (AAO Outreach Officer) had some months ago. As a native Spanish speaker I have to confess it is really hard to hear the pronunciation of “Guerrilla” following English phonemes as “Guerrilla Astronomy” sounds almost identical toGorilla Astronomy“. I would encourage to try to pronounce “Guerrilla” as it is said in Spanish (geˈri.ʝa) to be released of this confusion, but of course that is only my modest suggestion than can be completely ignored…