setting circle การใช้

• It can be used in place of or in conjunction with setting circles.
• Thomas Cooke equatorial with setting circles and a driving clock.
• Telescopes equipped with equatorial mounts and setting circles employ the equatorial coordinate system to find objects.
• Gill used his telescope's digital setting circles to take precise readings of the unknown object's location.
• When telescopes became commonplace, setting circles sped measurements
• Digital setting circles take a small computer with an object database that is attached to encoders.
• This can be assisted using setting circles.
• Equatorial mounts could then be accurately pointed at objects with known right ascension and declination by the use of setting circles.
• Sometimes the right ascension setting circle has two scales on it : one for the Northern and one for the Southern hemisphere.
• Locating an object on the celestial sphere with setting circles is similar to finding a location on a terrestrial map using latitude and longitude.
• Setting circles in conjunction with a star chart or ephemeris allow the telescope to be easily pointed at known objects on the celestial sphere.
• High on the agenda for the Dallas meeting, he said, is the question of whether to expand the industry's standard-setting circle to include cellular companies.
• Setting circles consist of two graduated disks attached to the right ascension ( RA ) and declination ( DEC ) axis of an equatorial mount.
• Also, even the finest graduations on setting circles are usually more than a degree apart, which makes them difficult to read accurately, especially in the dark.
• Many Right Ascension setting circles therefore carry two sets of numbers, one showing the value if the telescope is aligned in the northern hemisphere, the other for the southern.
• Even with some inaccuracies in polar alignment or the perpendicularity of the mount, setting circles can be used to roughly get to a desired object's coordinates, where a star chart can be used to apply the necessary correction.
• The telescope is equipped with CCD cameras allowing high quality observations to be made using it, but unlike the other telescopes on site which have computer-controlled pointing systems, the 0.80 m telescope must still be pointed manually, using setting circles.
• Setting circles are also used in a modified version of star hopping where the observer points the telescope at a known object and then moves it a set distance in RA or declination to the location of a desired object.
• If the setting circles of the mount is then used to find a bright object of known coordinates, the object should only mismatch in azimuth, so centering the object by adjusting the azimuth of the mount should complete the polar alignment process.
• More advanced methods of locating objects in the sky include telescope mounts with " setting circles ", which assist with pointing telescopes to positions in the sky that are known to contain objects of interest, and " GOTO telescopes ", which are fully automated telescopes that are capable of locating objects on demand ( having first been calibrated ).