YD meaning in Space Science ?

Answer: What is Yard mean?

The yard (symbol: yd) is an English unit of length, in both the British imperial and US customary systems of measurement, that comprises 3 feet or 36 inches. Since 1959 it is by international agreement standardized as exactly 0.9144 meters. 1,760 yards is equal to 1 mile.

The US survey yard is very slightly longer.

reference

Full Form	Category
Yohkoh Data	Business
Youth Defence	Community
Yaw Damper	General
Yard Dog	General
Floating Crane (Yardcraft, Derrick)	General
Yield Deviation	General
Young Deer	General
Younger Dryas	General
Yaptinchay and Dy	General
Yearn to Do	General
Year Date	General
Year to Date	General
Yellow Dust	General
Yasmin and Diana	General
You Don	General
Yankee Division	General
Yes Dear	General
Young Driver	Governmental
Young Democrats	Governmental
Year Down	Internet
Yellow Death	Medical
Your Darling	Messaging
Yard	Space Science
Young Divers	Sports
Yorkshire Divers	Sports