← Another date

Birthday · September 21, 2020

Omega Sunrise

September 21, 2020

You were born on a tiny world orbiting an ordinary star in an unremarkable galaxy — and yet, the fact that you exist at all is the most...

Omega Sunrise

A little universe, just for you

Your date.
Ready to give.

Free PNG · 1080 × 1350 · No account needed

Image rights and credit requirements apply when sharing or reusing imagery.

Change the year

APOD published September 21, 2020. Credit: Juan Antonio Sendra. A publication-date match, not a photo taken on your date. Independent of NASA.

Behind the image

Omega Sunrise

Original APOD · September 21, 2020

Capturing this sunrise required both luck and timing. First and foremost, precise timing was needed to capture a sailboat crossing right in front of a rising Sun. Additionally, by a lucky coincidence, the background Sun itself appears unusual -- it looks like the Greek letter Omega (Ω). In reality, the Sun remained its circular self -- the Omega illusion was created by sunlight refracting through warm air just above the water. Optically, the feet of the capital Omega are actually an inverted image of the Sun region just above it. Although somewhat rare, optical effects caused by the Earth's atmosphere can make distant objects near the horizon -- including the Sun and Moon -- look quite unusual. This single exposure image was taken over the Mediterranean Sea just over two weeks ago near Valencia, Spain.

Image credit: Juan Antonio Sendra

Explore September 21 in other years