Time-Lapse Video: The Rising Dance of the Eclipsed Sun and Moon

Bad Astronomy
The entire universe in blog form
May 15 2013 10:07 AM

Time-Lapse Video: The Rising Slow-Motion Dance of the Eclipsed Sun and Moon

annular eclipsed Sun
The rising eclipse; part of an astonishing time-lapse video.

Photo and video by Geoff Sims/Colin Legg

Remember the amazing picture I posted last week of the squashed, eclipsed Sun rising into the Australian sky? That photo was part of a time-lapse video that, at the time, was being put together by photographers Colin Legg and Geoff Sims.

Phil Plait Phil Plait

Phil Plait writes Slate’s Bad Astronomy blog and is an astronomer, public speaker, science evangelizer, and author of Death From the Skies!  

They finished it. Trust me: Take two minutes of your life, make this full screen, sit back, and be in awe of the show nature puts on for us.

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Phenomenal.

This eclipse was from last week, May 10, when the Moon passed directly in front of the Sun. The Moon’s orbit is elliptical, and it happened to be at a point where it is farther away than average when the eclipse occurred. Usually, the Moon and Sun are about the same size in the sky, but in this case the Moon’s added distance made it a bit smaller, and it couldn’t completely cover the Sun’s face. It left a ring, or annulus, of Sun circling the Moon’s silhouetted disk.

There were three major effects playing together to make this cosmic ballet so amazing. One is simply the daily turning of the Earth, so that we see the Moon and Sun rising. The second is atmospheric effects distorting the shape of the two as they rose. Near the horizon, this effect is very pronounced; it acts to flatten objects, so as they rise they look like they stretch out into their normal shape.

The third is the slowest, but most amazing of all. The Moon is orbiting the Earth, and that motion, as seen in this video, is in almost the opposite direction of the Sun and Moon rising. So it looks like the Sun is rising a hair faster than the Moon, changing the phase and shape of the eclipse. The eclipse goes from a full ring to a crescent, the horns pointing downward, shrinking as the two rise at different paces.

The combination—sunrise, vertical expansion, and changing phase—becomes a gorgeous and smoothly surreal view of two of our nearest celestial neighbors. We see them almost every day, and even those of us who observe and appreciate them all the time will stand and gawk in awe when they work together in this way.

My thanks to both Legg and Simms for sending me their photos, and alerting me to this movingly poetic video. I hope they continue to watch and photograph the skies, allowing all of us to participate in these spectacular events vicariously through them.

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