The Night Sky in July


    FULL moon occurs on July 10d. 07h. 41m., U.T., and new moon on July 25d. 19h. 33m.The following conjuctions with the moon take place : July 11d. 02h jupiter 5 N. ; July 23d. llh., Mars 4° S. ; July 27d. 18h; Venus 2° S. ; July 28d. Olh., Saturn 2°S. In addition to these conjunctions with the Venus is in conjunction with Saturn on July 3Id. 06h., Venus 0-2° S. Mercury rises an hour before the sun during the first half of the month and later on becomes an evening star, but sets too soon after sunset to be visible. Venus sets more than an hour after the sun on July 1 and 31, and can be seen as an evening star throughout the month ; about nine-tenths of the illuminated disk is visible during July. Mars is a morning star, rising at 2h. 10m., Ih. 50m. and Ih. 33m. at the beginning, middle and end of the month, respectively. The planet is fairly close to Tauri towards the middle of the month. Jupiter, in the constellation of Sagittarius, rises in the early night hours and can be observed low down in the heavens ; but as the planet does not attain an altitude greater than 18° in the latitude of Greenwich, it is not favourably placed for observation in higher northern latitudes. It is in opposition to the sun on July 20. Saturn, in the constellation of Leo, is visible during the early portion of the night, setting at 22h. 45m. and 20h. 52m. at the beginning and end of the month, respectively. Occultations of stars brighter than magnitude 6 are as follows : July 6d. 22h. 44·7m., 40B. Scor. (D) ; July 21d. Olh. 17·4m., 133B. Taur. (R). D and R refer to disappearance and reappearance, respectively, and the latitude of Greenwich is assumed. The earth enters aphelion on July 2.

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    The Night Sky in July. Nature 163, 988 (1949).

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