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    Weems and Plath Celestial Slide Rule
    From: Ed J.
    Date: 2020 Apr 8, 10:52 -0700

    I am looking for instructions for this device and would be grateful if anyone can post a copy or knows how to use this.

    [image attached below]

    Celestial Slide Rule The celestial slide rule will significantly reduce the effort and time for determining values used in celestial navigation. This quick and easy device is also a great complement to your navigation computer. The slide rule has GHA (Greenwich Hour Angle), LHA (Hour Angle), t (Meridian Angle), SHA (Sidereal Hour Angle) and observers meridian. When two or more of the values are known, the rest can be determined by a single alignment. Diameter: 7". Wt. 2 oz. 7543 Weems & Plath Celestial Slide Rule

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