Journal cover Journal topic
Geoscientific Instrumentation, Methods and Data Systems An interactive open-access journal of the European Geosciences Union
doi:10.5194/gi-2017-11
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
27 Mar 2017
Review status
This discussion paper is under review for the journal Geoscientific Instrumentation, Methods and Data Systems (GI).
Semi-automatic sunshots with the WIDIF DIflux
Jean L. Rasson, Olivier Hendrickx, and Jean-Luc Marin Royal Meteorological Institute, Centre de Physique du Globe, Dourbes, 5670, Belgium
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 Suns' 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 localisation provided by the on board GPS receiver, an astronomical computation can be effectuated and the Sun azimuth as well as an auxiliary's target azimuth can easily and quickly be determinated. The precise Sun's crossing of the split photocell, amplified by the telescope's magnification allows azimuth' accuracies of a few seconds of arc.

Citation: Rasson, J. L., Hendrickx, O., and Marin, J.-L.: Semi-automatic sunshots with the WIDIF DIflux, Geosci. Instrum. Method. Data Syst. Discuss., doi:10.5194/gi-2017-11, in review, 2017.
Jean L. Rasson et al.
Jean L. Rasson et al.
Jean L. Rasson et al.

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Short summary
In geomagnetism, geodesy and in general disciplines requiring orientation on Earth, accurately finding the direction of True North is a challenge. This paper describes a method to do so using a traditional theodolite and the proposed apparatus: an electro-optical add-on. The details of the concepts, design and operation of the add-on are explained.
In geomagnetism, geodesy and in general disciplines requiring orientation on Earth, accurately...
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