Sûrya-Siddhânta: A Text-book of Hindu Astronomy
The oldest and most important treaitse of the post-Christian period on Indian Astronomy that has come down to us is the Surya Siddhanta consisting 14 chapters written in slokas. Alberuni says that Lata was the author of this work. According to the introductory verses Surya the sun-god revealed it to Asura Maya in the city of Romaka.
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according altitude amount angle apsis Arab Aryabhata ascensional difference ascertain asterisms astronomical Brahmagupta calculation centre chapter Chinese circle Colebrooke commentary correction corresponding daily motion declination deduct deflection derived determined diameter direction distance divided earth eclipsed body ecliptic-point epicycle equal equator equinoctial shadow equinox equivalent error farther given gives gnomon Graha-Laghava Greek half-duration Hindu astronomy horizon hour-angle hypothenuse interval junction-star Jupiter Krttika latitude latter lunar day lunar eclipse mean motion measure Mercury meridian method midnight month moon's latitude moon's mean multiplied nadis nakshatra node obscuration orbit parallax in latitude parallax in longitude passage planets polar longitude position precession prime vertical proportion quadrant radius reckoned regarded respectively result revolution right ascension rule Siddhanta sidereal sidereal day sieu signs sine sine of ecliptic solar square stars subtract sun and moon sun's sunrise Surya Surya-Siddhanta tion treatise true longitude verse yojanas zenith-distance
Стр. 61 - Consequently, the active pressure operating in a circuit with self-induction, is equal to the square root of the difference between the squares of the impressed and the inductive electric pressures.
Стр. 152 - Tilhis passed; reduce the remainder to minutes, and multiply them by 60. Divide this product by the difference of the daily motions of the sun and moon, and the quotient will be Nalikeis. Multiply the remainder by 60, and divide by the same divisor, for Vinalikeis.
Стр. 114 - The square of the hypothenuse is equal to the sum of the squares of the other two sides ; as, 5033 402+302.
Стр. 3 - If this verse really formed a part of the text, it would be as clear an acknowledgment as the author could well convey indirectly, that the science displayed in his treatise was derived from the Greeks. Romaka-city is Rome, the great metropolis of the West; its situation is given in a following chapter (see xii.
Стр. 389 - Hindu astronomy, with its apparatus of excentrics and epicycles, bears in many respects to that of the Greeks, be thought to authorize a belief, that the Hindus received from the Greeks that knowledge which enabled them to correct and improve their own imperfect astronomy, I shall not be inclined to dissent from the opinion.
Стр. 110 - For the shadow, we have the common word chAyA, "shadow," and also, in many places, prabhA and bh&, which' properly signify the very opposite of shadow, namely " light, radiance :" it is difficult to see how they should come to be used in this sense ; so far as we are aware, they are applied to no other shadow than that of the gnomon. 6. The east and west line is called the prime vertical (samamandala) ; it is likewise denominated the east and west hour circle (unmandala) and the equinoctial circle...
Стр. 8 - ... Northern India the year is lunisolar ; the month is lunar, and is divided into both lunar and civil days ; the year is composed of a variable number of months, either twelve or thirteen, beginning always with the lunar month of which the commencement next precedes the true commencement of the eidereal year.
Стр. 71 - The period of the planet's revolution about the centre of the epicycle is the time which it takes the latter to make the circuit of the orbit from the apsis around to the apsis again, or the period of its anomalistic revolution. This is almost precisely equal to the period of sidereal revolution in the case of all the planets excepting the moon, since their apsides are regarded by the Hindus as stationary (see above, under i.
Стр. 389 - On the Notions of the Hindu Astronomers concerning the Precession of the Equinoxes and Motions of the Planets...
Стр. 7 - A lunar month, of as many lunar days (tithï); a solar (sàura) month is determined by the entrance of the sun into a sign of the zodiac : twelve months make a year We have here described days of three different kinds, and months and years of four; since, according to the commentary, the last clause translated means that twelve months of each denomination make up a year of the same denomination. Of some of these, the practical use and value will be made to appear later ; but as others are not elsewhere...