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Extra info for A Modern Almagest: An Updated Version of Ptolemy’s Model of the Solar System

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B) 36 MODERN ALMAGEST Aries λ ◦ Mag. 6 γ PEG η PSC ◦ 04 50 10◦ 08 ′ 11◦ 28 ′ 22◦ 08 ′ 23◦ 51 ′ Taurus Mag. 0 β ARI α ARI 15 5 19◦ 22 ′ Gemini β Mag. 7 η TAU α TAU β TAU ◦ 02 34 02◦ 56 ′ 03◦ 11 ′ 07◦ 48 ′ 09◦ 46 ′ 11◦ 27 ′ 17◦ 58 ′ Cancer β Mag. Name λ β ′ ◦ 09 09 26◦ 49 ′ +12 36 +5◦ 23 ′ λ β ◦ ′ 03 58 07◦ 39 ′ λ ◦ ′ 00 00 09◦ 47 ′ 22◦ 34 ′ λ ◦ ′ ◦ ′ ′ +8 29 +9◦ 58 ′ ◦ ′ +4 03 −5◦ 28 ′ +5◦ 23 ′ ◦ ′ 05 18 09◦ 06 ′ 09◦ 56 ′ 20◦ 14 ′ 23◦ 13 ′ − 0 49 − 6◦ 44 ′ + 2◦ 04 ′ +10◦ 06 ′ + 6◦ 41 ′ λ β β ′ ′ ◦ ′ 20 47 29◦ 37 ′ 29◦ 50 ′ +9 43 +8◦ 49 ′ +0◦ 28 ′ λ β ′ 06 23 13◦ 25 ′ 17◦ 34 ′ 27◦ 10 ′ ◦ ′ +0 09 +9◦ 40 ′ +6◦ 06 ′ +0◦ 42 ′ λ Scorpio β Mag.

However, it should be noted that, according to the modern definition, the parallactic angle is 90◦ − µ. From Eqs. 45) respectively. , point D in the diagram), and t is measured in time-degrees. Note that if t is positive then it measures time before culmination, whereas if it is negative then its magnitude measures time after culmination. It follows from Eqs. 47) respectively. From Eq. 48) 32 MODERN ALMAGEST is directed from the observation site to point Y. 49) is tangent to the ecliptic circle, at point Y, in the direction of increasing ecliptic longitude.

6 α LIB β LIB Sagittarius β Mag. 4 δ SCO π SCO β SCO σ SCO α SCO τ SCO η OPH Capricorn β Mag. 1 µ GEM γ GEM ǫ GEM α GEM β GEM 01 16 04◦ 34 ′ 06◦ 19 ′ 12◦ 23 ′ 13◦ 38 ′ 16◦ 15 ′ Mag. 4 ǫ LEO γ LEO α LEO ◦ 23 24 23◦ 33 ′ +8 37 −2◦ 36 ′ Mag. 9 γ SGR δ SGR λ SGR σ SGR ζ SGR π SGR Aquarius β Mag. 0 Leo ◦ ◦ Libra Mag. 9 β AQR δ CAP Pisces Mag. 1: Ecliptic longitudes (relative to the mean equinox at the J2000 epoch), ecliptic latitudes, and visual magnitudes of selected bright stars lying within 10◦ of the ecliptic plane.

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A Modern Almagest: An Updated Version of Ptolemy’s Model of the Solar System by Richard Fitzpatrick


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