Launches
ON RECORD22MISSIONS
22 of them reached orbit. The earliest was 1962, the most recent 2026.
ARCHIVE // DAY OF YEAR
22 orbital launches flew on April 23, the earliest of them in 1962, and 22 reached orbit. Wikipedia records 3 spaceflight and astronomy events on April 23. Below are the pictures NASA published on April 23 in 4 different years — each one taken or released on this exact date.
22MISSIONS
22 of them reached orbit. The earliest was 1962, the most recent 2026.
3ENTRIES
Spaceflight and astronomy entries from Wikipedia's record of this date, oldest first — from -215 onward.
4IMAGES
NASA's Astronomy Picture of the Day for April 23, one per year. Some are public domain and some belong to the photographer — each says which.
NASA’s Astronomy Picture of the Day, for this calendar date in each of the last several years.

2025
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
NASA · public domain

2024
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
NASA · public domain

2023
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
NASA · public domain

2022
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
NASA · public domain
-215
A temple is built on the Capitoline Hill dedicated to Venus Erycina to commemorate the Roman defeat at Lake Trasimene.
Temple of Venus Erycina (Capitoline Hill) ↗1967
Soviet space program: Soyuz 1 (Russian: Союз 1, Union 1), a crewed spaceflight carrying cosmonaut Colonel Vladimir Komarov, is launched into orbit.
Soviet space program ↗2009
The gamma-ray burst GRB 090423 was detected coming from the most distant astronomical object of any kind known at the time.
Gamma-ray burst ↗General-audience astronomy and spaceflight — none of it a textbook.
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LISTING
Still the best single argument for why any of this matters, and it leaves the arithmetic in. For a reader who wants the science, not just the awe.
LISTING
The case for leaving Earth, written by someone unsentimental about how hard that is. Suits readers who want the argument rather than the poster.
LISTING
Hard-SF problem solving in The Martian's key — for anyone who liked the engineering more than the peril. The only novel on this list.
BROWSE opens an Amazon search, not a specific recommendation.
LINKS AMAZON.COM
Event text and thumbnails come from Wikipedia and are used under CC BY-SA 4.0. Images are drawn only from Wikimedia Commons, which does not accept non-free content — each thumbnail links to its file page, where its licence and author are recorded.
Launch records are from The Space Devs’ Launch Library 2. Pictures are NASA’s Astronomy Picture of the Day; NASA imagery is generally not subject to copyright, but individual APOD entries are frequently the property of the photographer, and each caption says which applies.