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ATS officers-in-training crew a 90 cm searchlight in Western Command, 1944. A searchlight (or spotlight) is an apparatus that combines an extremely bright source (traditionally a carbon arc lamp) with a mirrored parabolic reflector to project a powerful beam of light of approximately parallel rays in a particular direction.
Sky Chart – Free Northern Sky Chart Cutout. Planispherium – Free Northern Sky Chart Cutout in Latin; SFA Star Charts – Free star charts; Geody Star Charts – Free (CC-by-sa) printer friendly star charts for several latitudes and times of the year; An online star chart; Monthly sky maps for every location on Earth Archived 2007-09-13 at ...
The fourth is the declination sign (- for negative and + for positive). The next three parameters are the declination (degrees, minutes and seconds) and the last the distance in light years, used for calculating the zoom. The standard last parameter in constellations is the number 10. Put this template at the end of astronomical object articles.
Gaia Sky is an open-source astronomy visualisation desktop and VR program with versions for Windows, Linux and macOS.It is created and developed by Toni Sagristà Sellés in the framework of ESA's Gaia mission to create a billion-star multi-dimensional map of our Milky Way Galaxy, in the Gaia group of the Astronomisches Rechen-Institut (ZAH, Universität Heidelberg).
z: Zoom level (1-18); if unspecified, the template uses WikiSky's zoom. If this isn't satisfactory, for bright stars z should be 5; for an average deep sky object, 9-10; for SN 1987A's remnant, 14 is more suitable. name: Name to display in the link; if unspecified, defaults to the name of the page.
A star tracker is an optical device that measures the positions of stars using photocells or a camera. [1] As the positions of many stars have been measured by astronomers to a high degree of accuracy, a star tracker on a satellite or spacecraft may be used to determine the orientation (or attitude ) of the spacecraft with respect to the stars.
The current versions has only one band of observation, that can produce misinterpretations if the light pollution changes from sodium-vapor lamp to LED. [8] The SQM-L, or "Sky Quality Meter - L," is a model with an additional integrated lens, offering a narrower measurement range of 20° compared to the 84° range of the standard SQM model. [9]
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