Accession Number:

AD0291670

Title:

RESEARCH DIRECTED TOWARD GEODETIC MEASUREMENTS BY OBSERVATIONS OF SOLAR ECLIPSES

Descriptive Note:

Corporate Author:

GEORGETOWN COLL WASHINGTON D C OBSERVATORY

Report Date:

1961-11-01

Pagination or Media Count:

1.0

Abstract:

Methods of obtaining and effecting reduction of data to apply to geodetic measurements from total and annular eclipses are described, with information on development of photographic and photo-electric observation techniques. A new method of reduction of photographic observation data, which does not include information on contact times, but which should yield accurate relative positions between observers was utilized to determine distances and azimuths between eclipse sites. Employment of a new set of accurate limb-tracings of photographic derivation to obtain limb-correction data proved successful. Digitizing of the equipment utilized in measuring the periphery of crescent images of the partially-eclipsed sun is described briefly. Application of a Burroughs E101 increased accuracy of the reduction work and permitted effective use of eleven decimal places. Accuracy and speed of measurements of the solar eclipse photographs was improved by installation of a projection reader, which was introduced to the digitizing system. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE