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This would normally have been the name for the #2 spacecraft in the HEAO Program series, but as far as I know was never used, the name being HEAO B before launch, and then "Einstein Observatory", probably in recognition of the outstanding improvement in performance of the focusing X-ray telescope over previous experiments.

NASA liked (& likes) to use a non-commital name prelaunch, and then give observatories more formal names once they are up and working. HEAO 1 & 3 were originally HEAO A and HEAO C before launch, which accounts for the instrument names in the program Wwheaton ( talk) 04:07, 28 March 2008 (UTC) reply

It is far more important to give the initial orbital altitude than to give its inclination:

The Einstein Observatory, HEAO-2, was launched on November 13, 1978, from Cape Canaveral, Florida, on an Atlas-Centaur SLV-3D booster rocket into a near-circular orbit with an initial altitude slightly above 500 km. Its orbital inclination orbit was 23.5 degrees.

The orbital altitude is a strong factor in the lifetime of the satellite, whereas, the inclination for an astronomy satellit doesn't mean too much at all. 74.249.82.221 ( talk) 18:10, 24 September 2008 (UTC) reply

one of the very fun things about LIGO is reading about the insane specification for how sensitive it is to changes in the distance between mirrors -iirc, something like a picometer (!!) over 3 Km (!!!!)

it would be really nice if this simnple and fascinating number were in this article, even if it is a provisional specification please note that a number that includes stain is not suited to a general encylopedia, much less some arcane jargon like 1/strain(Hz)^-1/2

thanks