The sky on
your birthday.
Daphnis the Wavemaker
Saturn's moon Daphnis, only about 8 kilometers across, orbits within the planet's Keeler gap. As it moves, its weak gravity creates waves in the ring material at the gap's edges. The Cassini spacecraft captured this close-up view, showing the 42-kilometer wide gap foreshortened by the viewing angle. This interaction demonstrates the subtle gravitational dance within Saturn's ring system.
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Released on your day
Space pictures released on your month and day in other years, or a few days either side. Each one is sharp enough to print as a poster.
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The Sun on your day The Sun on 21 January 2017 See it as a poster -
The Earth on your day The Earth on 21 January 2017 · Eye of the Sahara, Mauritania See it as a poster -
Released on 21 January 2016 Hubble Unveils a Tapestry of Dazzling Diamond-Like Stars See it as a poster -
Released on 21 January 2016 Dazzling diamonds of Trumpler 14 See it as a poster -
Released on 21 January 2004 Empty Nest See it as a poster -
Released on 21 January 2025 The city lights of Lima, Peru See it as a poster -
Released on 21 January 2025 The city lights of Buenos Aires, Argentina See it as a poster
In tropical astrology, 21 JAN 2017 falls under Aquarius (♒). The sign's window runs from 01-20 through 02-18. Aquarius is home to the Helix Nebula, the closest planetary nebula to Earth. The Sun was crossing this region of the sky on 21 JAN 2017.
Questions about January 21, 2017
What space photo was released on January 21, 2017?
NASA's Astronomy Picture of the Day for January 21, 2017 was "Daphnis the Wavemaker". It's the card at the top of this page.
What was the Moon's phase on January 21, 2017?
A last quarter moon, about 38% lit.
What day of the week was January 21, 2017?
January 21, 2017 was a Saturday, day 21 of the 365 days in 2017.
What did the Sun and the Earth look like on January 21, 2017?
NASA's Solar Dynamics Observatory photographed the Sun that day, and NASA's Terra satellite photographed the whole Earth. Both are on this page, next to the card.
Is it free?
Yes. Seeing, sharing and downloading the card is free, and there's no account to make.