ABSTRACT.I describe a simple new method for collimating a Cassegrain telescope that gives near-perfect correction over a wide field of view. This method was used to collimate the 6.5 m MMT in 2002 ...
PREVIOUS attempts to measure the annual parallax of intense radio stars 1,2 have indicated that their distances exceed 1/50 parsec. These results were obtained by using an interferometer arrangement ...
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