Launches
ON RECORD18MISSIONS
18 of them reached orbit. The earliest was 1965, the most recent 2023.
MARKED ON THIS DATE
1969 · 57 years ago today
Tranquility Base
Armstrong and Aldrin landed Eagle in the Sea of Tranquility with about twenty-five seconds of fuel remaining.
read more1976 · 50 years ago today
Viking 1 lands on Mars
Viking 1 became the first spacecraft to land on Mars and return pictures, on Chryse Planitia.
read moreARCHIVE // DAY OF YEAR
18 orbital launches flew on July 20, the earliest of them in 1965, and 18 reached orbit. Wikipedia records 6 spaceflight and astronomy events on July 20. Below are the pictures NASA published on July 20 in 5 different years — each one taken or released on this exact date.
18MISSIONS
18 of them reached orbit. The earliest was 1965, the most recent 2023.
6ENTRIES
Spaceflight and astronomy entries from Wikipedia's record of this date, oldest first — from 1969 onward.
5IMAGES
NASA's Astronomy Picture of the Day for July 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

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

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.
NASA · public domain
1969
The Apollo 11 Lunar Module Eagle landed on the Sea of Tranquillity, where Neil Armstrong and Buzz Aldrin became the first men to walk on the Moon six and a half hours later (bootprint pictured).
Apollo 11 ↗1969
Apollo program: Apollo 11's crew successfully makes the first human landing on the Moon in the Sea of Tranquility. Americans Neil Armstrong and Buzz Aldrin become the first humans to walk on the Moon six and a half hours later.
Apollo program ↗1976
The Viking 1 lander became the first spacecraft to successfully land on Mars and perform its mission.
Viking 1 ↗2019
Soyuz MS-13 is launched to the International Space Station on the 50th anniversary of the Apollo 11 moon landing.
Soyuz MS-13 ↗2021
American businessman Jeff Bezos flies to space aboard New Shepard NS-16 operated by his private spaceflight company Blue Origin.
Jeff Bezos ↗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.