setting circle

setting circle

[′sed·iŋ ‚sər·kəl]
(engineering)
A coordinate scale on an optical pointing instrument, such as a telescope or surveyor's transit.
References in periodicals archive ?
DIGITAL CATALOG Astro Devices introduces the Nexus DSC ($449.95), a digital setting circle computer for your telescope.
However, because his telescope had setting circles and a clock drive, Schiaparelli could point it to the right place in the sky and study Mercury for hours at a time.
A distributor will still spend hundreds of thousands of dollars to have one of their vodka brands advertised at a leading rooftop club to gain attention locally, also knowing the broader impact of Beirut's jet setting circles.
In fact an easy way to find the cluster for those using binoculars or telescopes without setting circles or GOTO is to sweep down from epsilon and delta Cas (the left hand side of the W shape of Cassiopeia) and continue for just under half the distance between these two stars.
Most small mounts offered commercially can be fitted with digital setting circles, which will help you locate faint targets.
Digital setting circles, too, were on display at RTMC in 1978, long before they (and Go To) took over the amateur world.
For the majority of observers therefore setting circles or a Go To telescope will be necessary to find it.
The German equatorial mount is equipped with dual-axis slow-motion controls (motor drive optional), and setting circles. Also included are a red-dot (reflex) finder and two 1.25-inch eyepieces--10 mm (100x) and 25 mm (40x).
Caption: Top: The telescope's new mount includes a motor drive, brass fittings, and digital setting circles. Bottom: This is one of the two adjustable counterweights added to aid balancing the optical tube assembly.
Most people these days locate it using go-to systems or setting circles, but for star-hoppers wanting a challenge the best starting point is probably mag 3.5 omicron UMa, from where there are plenty of mag 6 and 7 stars forming recognisable patterns leading to the planetary 8.4[degrees] to the southwest.
[Aided by] setting circles, I swung the telescope in the direction of the open star cluster M67 deep in the western twilight.