This was
your sky.
The Same Color Illusion
This image presents an optical illusion where squares A and B appear to be different colors but are, in fact, the same. This phenomenon, known as the same color illusion, highlights how human perception can be ambiguous or inaccurate. Similar illusions exist in astronomy, such as the apparent size of the Moon near the horizon.
We cannot put this date's photograph on paper at poster size. We can print the nearest public archive plate to your date instead.
Prints are coming soon. The card is free to save and share in the meantime.
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 18 December 2012 Hubble snaps NGC 5189 See it as a poster -
Released on 18 December 2024 Close look at a local galaxy See it as a poster -
Released on 18 December 2024 NGC 2566 (HST image) See it as a poster -
Released on 18 December 2012 Massive Star Makes Waves See it as a poster -
Released on 18 December 2023 Uranus widefield view (NIRCam) See it as a poster
In tropical astrology, 18 DEC 2023 falls under Sagittarius (♐). The sign's window runs from 11-22 through 12-21. Sagittarius points straight at the center of the Milky Way, our galaxy's brightest region. The Sun was crossing this region of the sky on 18 DEC 2023.