Astro-Azimuth Using Time Difference
Conventionally, the determination of astronomic azimuth involves the synchronization of the observations with a radio time signal or the measurement of zenith distances which are subject to refraction errors. A mathematical model is developed which is dependent upon time differences (not absolute ti...
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| Veröffentlicht in: | Journal of surveying engineering 1984-08, Vol.110 (2), p.112-118 |
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| container_end_page | 118 |
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| container_issue | 2 |
| container_start_page | 112 |
| container_title | Journal of surveying engineering |
| container_volume | 110 |
| creator | Vonderohe, Alan P Mezera, David F |
| description | Conventionally, the determination of astronomic azimuth involves the synchronization of the observations with a radio time signal or the measurement of zenith distances which are subject to refraction errors. A mathematical model is developed which is dependent upon time differences (not absolute time) and horizontal angles (nearly refraction-free) between pairs of stars. Error analysis indicates that an optimum star pair includes Polaris and any second star whose azimuth is at least moderately changing. Field tests indicate that the azimuth of Polaris may be determined to within 0.6 seconds of arc. The formation and solution of the necessary equation may be implemented on a programmable calculator. |
| doi_str_mv | 10.1061/(ASCE)0733-9453(1984)110:2(112) |
| format | Article |
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A mathematical model is developed which is dependent upon time differences (not absolute time) and horizontal angles (nearly refraction-free) between pairs of stars. Error analysis indicates that an optimum star pair includes Polaris and any second star whose azimuth is at least moderately changing. Field tests indicate that the azimuth of Polaris may be determined to within 0.6 seconds of arc. The formation and solution of the necessary equation may be implemented on a programmable calculator.</abstract><cop>Reston, VA</cop><pub>American Society of Civil Engineers</pub><doi>10.1061/(ASCE)0733-9453(1984)110:2(112)</doi><tpages>7</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0733-9453 |
| ispartof | Journal of surveying engineering, 1984-08, Vol.110 (2), p.112-118 |
| issn | 0733-9453 1943-5428 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_24426026 |
| source | American Society of Civil Engineers:NESLI2:Journals:2014 |
| subjects | Earth, ocean, space Exact sciences and technology External geophysics Geodesy and gravity TECHNICAL PAPERS |
| title | Astro-Azimuth Using Time Difference |
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