Guiding


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Guiding

 

in astronomy, an auxiliary operation that is performed when photographing heavenly bodies. In this operation, an observer, using micrometer screws or auxiliary drives of the telescope, holds some heavenly body in the crosshairs of an eyepiece micrometer mounted in the focal plane of an auxiliary telescope, known as a guiding telescope. (A displacement of the heavenly body from the crosshairs of a telescope that is rotating in conformance with the apparent diurnal motion of the sky may be caused by errors in the telescope’s manufacture, by atmospheric effects, or by a shift of the observed heavenly body relative to the stars.) Large astrographs often have a special device (a Ricci cassette) that makes it possible to use the optics of the photographic telescope itself for guiding.

References in classic literature ?
Susan, she found, looked up to her and wished for her good opinion; and new as anything like an office of authority was to Fanny, new as it was to imagine herself capable of guiding or informing any one, she did resolve to give occasional hints to Susan, and endeavour to exercise for her advantage the juster notions of what was due to everybody, and what would be wisest for herself, which her own more favoured education had fixed in her.
Violet still seemed to be the guiding spirit, while Peony acted rather as a laborer, and brought her the snow from far and near.
In defiance of these difficulties he pushed resolutely forward, guiding himself in his trackless course by those signs and indications known only to Indians and backwoodsmen; and after braving dangers and hardships enough to break down any spirit but that of a western pioneer, arrived safe at the solitary post in question.
It was not "Ireson's Ride" that the woman delivered, but some sort of poem about a fishing-port called Brixham and a fleet of trawlers beating in against storm by night, while the women made a guiding fire at the head of the quay with everything they could lay hands on.
SOCRATES: And what is the guiding principle which makes them profitable or the reverse?
The safety and summiting statistics speak much louder than the guiding companies themselves.