Education and demonstration – Science – Astronomy
Patent
1983-03-31
1985-03-19
Grieb, William H.
Education and demonstration
Science
Astronomy
G09B 2706
Patent
active
045056803
ABSTRACT:
The concept of The Spherical Star Chart With Indicator is based on the fact that a majority of the celestial objects maintain a constant angular relationship with each other. The distance of these celestial objects from the center of the earth is so great that parallax due to observations made from the surface of the earth is negligible. The motion of the earth in its orbit and the rotation of the earth about its axis cause the celestial objects to appear to move at a constant rate. When the axis of a sphere is aligned parallel to the axis of the earth and the sphere is made to rotate at the apparent rotation of the celestial objects then the co-ordinates of the position of a celestial object in the sky will be identical to the co-ordinates of its symbol on the sphere.
The linkage between the sight and the indicator as hereinbefore described assures that the movement of the indicator is equal to the movement of the sight.
Since most celestial observations are made at night the necessity of a lighted spot as an indicator is obvious.
Flat radial segments of the star chart facilitate the printing of and the application of the decalcomania to the star chart.
The use of pressure sensitive adhesive makes it easier to replace any one segment of the star chart when a change is necessary.
REFERENCES:
patent: 1422642 (1922-07-01), Walters
patent: 2083988 (1937-06-01), Dupler
patent: 2754597 (1956-07-01), Sylvestor
patent: 3257728 (1966-06-01), Blomquist
patent: 4096646 (1978-06-01), Solem
Dodd Thomas J.
Grieb William H.
LandOfFree
Spherical star chart with indicator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Spherical star chart with indicator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spherical star chart with indicator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-751069