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- Title
Semiautomatic sun shots with the WIDIF DIflux.
- Authors
Rasson, Jean L.; Hendrickx, Olivier; Marin, Jean-Luc
- Abstract
The determination of magnetic declination angle entails finding two directions: geographic north and magnetic north. This paper deals with the former. The known way to do it by using the sun's calculable orientation in the sky is improved by using a device based on a WIDIF DIflux theodolite and split photocells positioned on its telescope ocular. Given the WIDIF accurate timing and location provided by the onboard GPS receiver, an astronomical computation can be effected to accurately and quickly determine the sun's azimuth and an auxiliary mark's azimuth. The precise sun's crossing of the split photocell, amplified by the telescope's magnification, allows azimuth accuracies of a few seconds of arc.
- Subjects
MAGNETIC declination; GLOBAL Positioning System; THEODOLITES; PHOTOELECTRIC cells; AZIMUTH
- Publication
Geoscientific Instrumentation, Methods & Data Systems (GI), 2017, Vol 6, Issue 2, p257
- ISSN
2193-0856
- Publication type
Article
- DOI
10.5194/gi-6-257-2017