History of Primary mirror

	Revision 6 . . July 30, 2001 8:02 am by (logged).196.209.xxx
	Revision 5 . . July 29, 2001 8:18 am by (logged).186.1.xxx

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Changed: 1,2c1

The principle light gathering surface of a reflective telescope. See also astronomy.

The principal light gathering surface of a reflective telescope.