पृष्ठम्:लघुभास्करीयम्.djvu/१६५

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CHAPTER VII VISIBILITY AND CONJUNCTION OF THE PLANETS Minimum distances of the planets from the Sun at which they become visible: 1-2. If Venus corrected for the visibility corrections is 9 degrees (of time) distant from the Sun, it is visible. Jupiter, Mercury, Saturn, and Mars are visible in the clear sky when their distance (from the Sun) are nine degrees increased succes- sively by twos (i.e., when they are respectively at the distances of 11, 13, 15 and 17 degrees of time from the Sun). 1 The degrees of time multiplied by 10 are known as vinadikas. Since 360 degrees of time are equivalent to 60x60 vinadikas, therefore one degree of time is equivalent to 10 vinadikas. A rule relating to the determination of the degrees of time be- tween the Sun and a planet: 3. (When the planet is to be seen) in the east," (its) visibility should be announced by calculating the time (of rising of the part of the ecliptic between the Sun and the planet 3 ) by using the oblique ascension of that very sign (in which the Sun and the planet are situated); (when the planet is to be seen) in the west, (its) visibility should be announced by calculating the time (of letting of the part of the ecliptic between the Sun and the pla- net 3 ) by using the oblique ascension of the seventh sign. 4 A rule relating to the determination of the common longitude of two neighbouring planets when they are in conjunction in lon- gitude: 4-5. Divide the difference between the longitudes of the two given planets by the sum or difference of their daily motions 1 Gf. MBh, vi. 44. Also cf. A, iv. 4; ATT, (Sengupta), vi. 6.

  • Cf. MBh, vi. 46(i).

3 Corrected for the visibility corrections. « Cf. MBh, vi. 46(H).