Abstract
About 1500 meridian altitudes of the sun observed by Johannes Hevelius (1611–1687) at Danzig in the years 1652–1679 and about 1160 distances of fixed stars from the lunar limb obtained in 1658–1679 as well as 48 occultations of stars by the moon were analyzed with the aim to obtain a value of the time difference d ΔT = ET—UT between ephemeris time and universal time for the time of Hevelius. This time difference is a measure of the “clock error” of the rotation of the Earth caused mainly by secular deceleration due to tidal friction.
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© 1990 Springer-Verlag Berlin Heidelberg
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Wünsch, J. (1990). Astrometric Observations of Hevelius and Derived Values of ΔT (Dynamical time — Universal time). In: Brosche, P., Sündermann, J. (eds) Earth’s Rotation from Eons to Days. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-75587-3_3
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DOI: https://doi.org/10.1007/978-3-642-75587-3_3
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