The sky on
your birthday.
The Holographic Principle
The Holographic Principle, an unproven theory, suggests there is a maximum amount of information in a given region. Counterintuitively, the information content inside a room would depend on the area of its walls, not its volume. For a computer monitor, this principle estimates about 3 x 10^65 bits of information.
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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The Sun on your day The Sun on 23 April 2017 See it as a poster -
The Earth on your day The Earth on 23 April 2017 · Persian Gulf See it as a poster -
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 2017 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 2017.
Questions about April 23, 2017
What space photo was released on April 23, 2017?
NASA's Astronomy Picture of the Day for April 23, 2017 was "The Holographic Principle". It's the card at the top of this page.
What was the Moon's phase on April 23, 2017?
A waning crescent moon, about 9% lit.
What day of the week was April 23, 2017?
April 23, 2017 was a Sunday, day 113 of the 365 days in 2017.
Was there a meteor shower on April 23, 2017?
Yes: the Lyrid shower, peaked yesterday.
What did the Sun and the Earth look like on April 23, 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.