Launches
ON RECORD31MISSIONS
29 of them reached orbit. The earliest was 1965, the most recent 2026.
ARCHIVE // DAY OF YEAR
31 orbital launches flew on May 20, the earliest of them in 1965, and 29 reached orbit. Wikipedia records 7 spaceflight and astronomy events on May 20. Below are the pictures NASA published on May 20 in 6 different years — each one taken or released on this exact date.
31MISSIONS
29 of them reached orbit. The earliest was 1965, the most recent 2026.
7ENTRIES
Spaceflight and astronomy entries from Wikipedia's record of this date, oldest first — from 1217 onward.
6IMAGES
NASA's Astronomy Picture of the Day for May 20, 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.

2026
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

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.
© Maxime Oudoux — used with the credit NASA publishes

2021
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.
© Martin Dufour — used with the credit NASA publishes
1217
First Barons' War: English forces under William Marshal defeated French troops at the Battle of Lincoln.
First Barons' War ↗1217
The Second Battle of Lincoln is fought near Lincoln, England, resulting in the defeat of Prince Louis of France by William Marshal, 1st Earl of Pembroke.
Battle of Lincoln (1217) ↗1570
Cartographer Abraham Ortelius issues Theatrum Orbis Terrarum, the first modern atlas.
Cartography ↗1811
A British squadron under Charles Marsh Schomberg defeated a French force off Tamatave, Madagascar, that was attempting to reinforce the French garrison on Mauritius.
Charles Marsh Schomberg ↗1932
Amelia Earhart takes off from Newfoundland to begin the world's first solo nonstop flight across the Atlantic Ocean by a female pilot, landing in Ireland the next day.
Amelia Earhart ↗1956
In Operation Redwing, the first United States airborne hydrogen bomb is dropped over Bikini Atoll in the Pacific Ocean.
Operation Redwing ↗1964
Discovery of the cosmic microwave background radiation by Robert Woodrow Wilson and Arno Penzias.
Discovery of cosmic microwave background radiation ↗General-audience astronomy and spaceflight — none of it a textbook.
As an Amazon Associate I earn from qualifying purchases. Links here cost you nothing extra.
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.