When was this clue last seen?

This clue last appeared in the NYT Crossword on Friday, 27 August 2021.

It's calculated relative to the speed of sound

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calculatedrelativespeed

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This clue appeared in the NYT Crossword on Friday, 27 August 2021. The answer MACH is a 4-letter entry.

This answer appears frequently in crosswords. View MACH answer history →

What is the answer to "It's calculated relative to the speed of sound"?: MACH
How many letters is the answer to "It's calculated relative to the speed of sound"?: The answer has 4 letters.
When was this clue last seen?: This clue last appeared in the NYT Crossword crossword on Friday, 27 August 2021.
Has this crossword clue appeared before?: Yes. Variations of this clue have appeared 10 other times.

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