Geometrical instruments – Straight-line light ray type – Celestial
Patent
1988-06-22
1990-03-27
Haroian, Harry N.
Geometrical instruments
Straight-line light ray type
Celestial
33228, 33277, G01C 2104
Patent
active
049108751
ABSTRACT:
A longitude finder for locating the longitude on the earth of a defined location at which the user of the device is positioned. The device includes a reflective surface for viewing an image of one body in the solar system, such as the moon or a planet, while directly observing another body such as the north star. One specific form of the device is a mirror having side panels secured perpendicular to the mirror in parallel spaced relation to permit the user to directly view the north star above an image in the mirror of the moon or a defined planet. The other form of the device includes a sphere such as made of glass with side panels and handles for supporting this sphere whereby the first body in the solar system such as the north star is observed directly and a first reflection of the moon or a planet is seen in the outer surface of the sphere and a second reflection from the inner surface of the sphere while directly observing the north star in vertical alignment with the reflections. The exact Greenwich mean time is determined at the location of the user and a nautical almanac is consulted to establish the exact longitude of the user based upon whether the moon or a defined planet is used.
REFERENCES:
patent: 2871754 (1959-02-01), Marble
patent: 2918725 (1959-12-01), Ellsworth
patent: 4060908 (1977-12-01), Skallerup
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