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Preparing for observing

Earlier we discussed the absence of any need for lengthy set up procedures-a few checks as indicated in section 2.1 will reassure the observer. Directly the sky is dark enough, the night assistant will acquire a bright star, and SNAFU (calibrate out the pointing error) onto the centre of the IDS slit. He will then focus the telescope, thereafter the focus will track automatically as the temperature changes.

Tue Apr 12 04:13:28 BST 1994