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What does SD stand for?

SD stands for Sidereal Day (orbital mechanics)

This definition appears very frequently and is found in the following Acronym Finder categories:

  • Science, medicine, engineering, etc.

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Other Resources:
We have 158 other meanings of SD in our Acronym Attic

Samples in periodicals archive:

A geosynchronous orbit, for those of you who aren't yet conversant, is one with an orbital period of one sidereal day.
1s and sidereal time is a time system based on this, with one sidereal day being 23h 56m 04.
Jockey Gerald Avranche steered the favourite, owned by Al Nasseriyeh and trained by Alan Smith, past Danish Express while Thaqib was third and Sidereal Day fourth.
But Muthaqaf, owned by Fawzi Abdulla Nass, trained by Fawzi Nass and to be ridden by M O Callaghan, is expected to beat Thaqib and Sidereal Day for the top prize.