The representation of the circles of the sphere upon a plane; especially, a representation of the celestial sphere upon a plane with adjustable circles, or other appendages, for showing the position of the heavens, the time of rising and setting of stars, etc., for any given date or hour.
A projection or representation of the whole or part of a sphere on a plane.
A handheld device which shows the appearance of the night sky at any specified time of day and day of the year.
An observing aid for locating stars and constellations. It consists of two discs—one with the entire night sky and the other with an opening through which the lower disc shows a star map of the sky. The second disc is set according to the date and time and shows what the night sky looks like at that moment.
a compact, rotating star map
a complete picture of the sky in one hemisphere)
a device that reduces the sphere of stars to a plane surface
a device which reduces the sphere of stars down to a plane
a disk which shows you which stars should be visible from your location at any date and time you select
a helpful instrument, which every amateur star gazer should have
a map of the sky and the constellation
a map of the starry night sky
a portable device that shows the stars and constellations visible in the night sky at any given date and time
a simple star chart made like a circular slide rule that can easily be set to show the positions of stars in the sky at a certain day and time
a sky map that can be adjusted to the date and time, showing the current stars and constellations
a small map of the heavens printed on a circular piece of paper or plastic about eight inches wide (different models vary)
a star chart with a horizon overlay that allows you to see which constellations are up on a given day or time
a tool for showing you what stars are visible at a given time and a given night
a wonderful plastic gadget that shows where in the sky any particular constellation will be at any time of night during any part of the year
An aid to finding things in the night sky. It consists of two discs: one with the entire night sky and the other has a window. One sets the second disc according to the time and date and the portion of the sky visible at that time is displayed through the window.
The projection of a sphere (or part thereof) onto a plane. It commonly refers to a simple device which consists of a pair of concentric discs, one of which has part of the celestial sphere projected onto it, the other of which has a window representing the horizon. Scales about the perimeters of the discs allow it to be set to show the sky at specific times and dates, enabling its use as a simple and convenient aid to location of objects.
A modern astronomical aid descended from the astrolabe. It shows the stars visible from one hemisphere (half of the world) on a small, hand-held map. It is adjustable to show the positions of the stars overhead for any date and time.
A map of the circumpolar hemispheres with a rotating overlay, showing the skies at any given time of the year.
An aid to locating stars and constellations in the night sky. It consists of two discs. One with the entire night sky, and the other, which covers the first, having a window through which a portion of the sky can be seen. The second disc is set according to the date and time.
a two-dimensional map of the sky with an adjustable overlay to show the part of the sky visible at any time of the night or year
a representation of a spherical body on a flat surface, commonly a map of the earth or of the heavens.
A circular star chart which rotates inside a masked envelope with a oval display cut into it. By dialing the current time to the current date on the outer index of the disk the current stars and constellations for the time and date are displayed in the oval. there is some distortion in the view.
A planisphere consists of a circular star chart attached at the center of the starchart to an opaque overlay that has a clear roundish window (or cutout hole) that is free to rotate about the pivot point. The border of the window (or cutout) represents the horizon. Planispheres are used to show which stars are visible in the night sky on a given day and time.
