An introduction to astronomy : designed as a text book for the students of Yale College (1846)
Olmsted, Denison, 1791-1859, Yale College (1718-1887) · New York : Collins, Brother & Co. · leaf 204
obtain a sight of Mercury, and Delambre saw it but twice. INFERIOR PLANETS MERCURY AND VENUS. 179 Let S (Fig. 60,) represent the sun, ADB the orbit of Mercury,and E the place of the Earth. Each of the planets is seen at itsgreatest elongation, when a line, EA or EB in the figure, is a tan-gent to… … 303. A planet is said to be in conjunction with the sun, when itis seen in the same part of the heavens with the sun, or when ithas the same longitude. Mercury and Venus have each two con-junctions, the inferior and the superior. The inferior conjunctionis its position when in conjunction on the…
Astronomy
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