May 21

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May 21 is the 141st day of the year (142nd in leap years) in the Gregorian calendar. 224 days remain until the end of the year.

Real-life events

1969	Gene Cernan, Thomas Stafford, and John Young enter Luna orbit as part of the Apollo 10 "dress rehearsal" mission.
2021	Day 1 of the 2951 Invictus Launch Week event, featuring the manufacturers 罗伯茨太空工业, 起源跃动, 联合外域, and 南船座宇航.^[1] The 罗伯茨太空工业天蝎座 is being offered for the first time as a limited concept pledge to all backers.^[2]

2951	The 2951 Invictus Launch Week starts at the 托宾会展中心 on microTech^[3]

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