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accuracy angular anticlockwise arithmetic mean assumed astro-triangle axis azimuth base line Calculate camera catenary celestial celestial sphere central meridian centre circle co-ordinates coefficients computed condition equations Consider correction cosine rule declination deﬁned diagram difference Earth Earth’s surface east elongation equal Example ﬁeld ﬁgure ﬁnal ﬁrst ﬁx ﬁxed ﬁxes ﬂying height focal length geoid give Greenwich meridian ground horizontal angle hour angle instrument isocentre latitude latitude and longitude least squares longitude mean measured clockwise method normal equations observation equations observed altitude observed values observer’s meridian obtained overlap parallax plane plotted plumb point Polaris position principal point radius refraction relative required to ﬁnd Right Ascension scale side sidereal Similarly sine rule spherical excess spherical triangle spheroid standard error standardised Star Almanac station stereoscope strip student sun’s survey tape temperature tension theodolite tilt upper transit