The sky on
your birthday.
Io Shadow
Jupiter's volcanic moon Io orbits the gas giant every 43 hours, about 500,000 kilometers above its clouds. The Hubble Space Telescope captured Io and its shadow crossing Jupiter's face in 1997. This image shows reflective patches of sulfur dioxide frost on Io's surface. These observations help scientists understand Io's intense volcanic activity and Jupiter's dynamic atmosphere.
We cannot put this date's photograph on paper at poster size. We can print the nearest public archive plate to your date instead.
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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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Released on 23 April 2010 SDO: The Extreme Ultraviolet Sun See it as a poster -
Released on 23 April 2010 Star Clusters Young and Old, Near and Far See it as a poster -
Released on 23 April 2025 Planetary nebula NGC 2899 See it as a poster -
Released on 23 April 2025 Barred Spiral Galaxy NGC 5335 See it as a poster -
Released on 23 April 2010 Wide view of “Mystic Mountain” See it as a poster
In tropical astrology, 23 APR 1999 falls under Taurus (♉). The sign's window runs from 04-20 through 05-20. Taurus holds the Pleiades star cluster and Aldebaran, the red giant that marks the eye of the Bull. The Sun was crossing this region of the sky on 23 APR 1999.
Questions about April 23, 1999
What space photo was released on April 23, 1999?
NASA's Astronomy Picture of the Day for April 23, 1999 was "Io Shadow". It's the card at the top of this page.
What was the Moon's phase on April 23, 1999?
A first quarter moon, about 51% lit.
What day of the week was April 23, 1999?
April 23, 1999 was a Friday, day 113 of the 365 days in 1999.
Was there a meteor shower on April 23, 1999?
Yes: the Lyrid shower, peaked yesterday.
Is it free?
Yes. Seeing, sharing and downloading the card is free, and there's no account to make.