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The planetary hours are an ancient system in which one of the seven classical planets is given rulership over each day and various parts of the day. Developed in Hellenistic astrology, it has possible roots in older Babylonian astrology, and it is the origin of the names of the days of the week as used in English and numerous other languages.
Catching a glimpse of the planets will depend on the time of day and their relative distance from the planet at the time. For example, Venus, Saturn and Jupiter are best viewed after sunset at ...
Astronomers advise people hoping to see the planetary phenomena to go to an area with minimal light pollution and to allow at least 30 minutes to allow vision to adjust to the darkness.
The first hour of each day was named after the ruling planet, giving rise to the names and order of the Roman seven-day week. Modern Latin-based cultures, in general, directly inherited the days of the week from the Romans and they were named after the classical planets; for example, in Spanish Miércoles is Mercury, and in French mardi is Mars ...
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Directly above the 24-hour dial is the dial of the Primum Mobile, so called because it reproduces the diurnal motion of the stars and the annual motion of the sun against the background of stars. Each of the 'planetary' dials used complex clockwork to produce reasonably accurate models of the planets' motion.
14:56:38 Mercury 1°01' south of Jupiter 6.4° East November 13, 2017 06:10:03 Venus 17' north of Jupiter 13.8° West November 28, 2017 09:36:06 Mercury 3°03' south of Saturn 21.1° East December 6, 2017 11:29:41 Mercury 1°21' south of Saturn 13.9° East December 15, 2017 16:04:48 Mercury 2°14' north of Venus 5.9° West December 25, 2017
[14]: 1, 5 [7]: 1 The innermost ring of J1407b's disk extends out to a radius of 0.206 AU (30.8 million km; 19.1 million mi) and is the most opaque region of the disk. [ 14 ] : 9 Assuming the rings have a mass density proportional to their opacity, the total mass of J1407b's disk is roughly 100 lunar masses (1.23 Earth masses ).