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 periodicals archive ?
After nearly seven decades, Mary remains as passionate as ever about Guiding.
"Guiding is the basis on which I've built my life and I've built my life around the promise and the law.
The inner elements do the final guiding and also damp out vibrations normal to the tape plane to present a smooth motion over the head.
This slipping allows the tape lateral freedom to adjust to the roller flange's guiding pressure.
"It is incomprehensible," we wrote in one letter, "that Girl Guides of Canada, whose very Guiding Promise includes the words `be true to my faith' would select as a guest speaker a woman whose position on sexual morality is in direct opposition to so many faiths."
So much for the Christian principles upon which the Guiding movement was founded.
Currently, Alaska has no state or industry-wide licensing or certification program that closely regulates the guiding profession.