388. Now collect the Elements for projecting this Eclipse.

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Moon’s horizontal Parallax 55 32

Sun’s horizontal Parallax (always) 10

The Sum of both Parallaxes 55 42

From which subtract the Sun’s Semi-diameter 15 54

Remains the Semi-diameter of the Earth’s Shadow 39 48

Semidiameter of the Moon 15 2

Sum of the two last 54 50

Moon’s Latitude subtract 9 56

Remains the parts deficient 45 0

Moon’s horary motion 30 46

Sun’s horary motion subtract 2 24

Remains the Moon’s horary motion from the Sun 28 22

[Sidenote: To project a lunar Eclipse.

Astronomy Explained Upon Sir Isaac Newton's Principles And made easy to those who have not studied mathematics · 第 227 / 275 题