Apparatus for viewing a representation of the celestial vault

Details Apparatus for viewing a representation of the celestial vault Apparatus for viewing a representation of the celestial vault

1990-05-01

1991-04-02

Haroian, Harry N.

Geometrical instruments

Straight-line light ray type

Celestial

434289, 40363, G01C 1734

Patent

active

050036980

ABSTRACT:
An apparatus for viewing a representation of the celestial vault including a tube bearing a ring of graduations that indicate the dates of the days of a year, and a tube bearing a ring of graduations that indicate the hours of a day. The tubes are axially aligned and rotatable with respect to each other about the axis. One tube contains a representation of the night sky, and the other contains an element, such as a lens, for viewing the representation. The tubes are separably joined so that they can be disassembled, each tube rotated end-over-end through 180.degree., and the tubes reassembled. In one condition of assembly, a sky representation of the northern hemisphere is used, and in the other condition of assembly, a sky representation of the southern hemisphere is used.

REFERENCES:
patent: 1182384 (1916-05-01), Kennedy
patent: 1873595 (1932-08-01), Johnson
patent: 2032829 (1936-03-01), Bartky

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