Christmas Morning | ISS Lunar Transit

Passes of the International Space Station are very predictable. There are internet sites that will email you notification of a coming pass. This one by NASA is easy to use. I use a site called CalSky which also notifies me if the ISS is going to pass in front of the Sun or Moon for my location. These transits are brief lasting barely more than a second. I’ve written about seeing several transits of the Sun in these posts.

Transits of the Moon are more difficult to see. The CalSky site has notified me fewer times about lunar transits. When they do occur for my location, the weather is sometimes a problem. This Christmas morning a transit was to occur but the forecast called for very cloudy skies. I woke not expecting to see it. When I looked out the window, the Moon was shining brightly in a clear patch of sky. I got my camera ready and hoped it would stay clear. It did just barely long enough. Here are three frame-grabs from the video showing the ISS just before, during, and after the transit.

This is the video slowed down to 50% speed. It is best viewed on a large screen with quality set to HD. It is not likely visible on a phone or tablet screen. The transit begins at the 7 o’clock position and ends at the 2 o’clock position of the Moon’s face. It lasts only 2.5 sec on this video, only 1.24 sec in real time.

I’ve waited a long time to see this. It was great to have it occur on Christmas morning. What a nice present.

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