The civil days of the solar month begin at sunrise. They are The civil day. numbered 1, 2, 3, &c., in unbroken succession to the end of the month. And, the length of the month being variable for the reasons stated above, the number of the civil days may range from twenty-nine to thirty-two.
The civil days are named after the weekdays, of which the usual appellations (there are various synonyms in each case, and some of the names are used in corrupted forms) are in Sanskrit Ādityavāra or Ravivāra, the day of the sun, sometimes called Ādivāra, the beginning-day (Sunday); Sōmavāra, The weekday. the day of the moon (Monday); Maṅgalavāra, the day of Mars (Tuesday); Budhavāra, the day of Mercury (Wednesday); Bṛihas-pativāra or Guruvāra, the day of Jupiter (Thursday); Sukravāra, the day of Venus (Friday); and Śanivāra, the day of Saturn (Saturday). It may be mentioned, as a matter of archaeological interest, that, while some of the astronomical books perhaps postulate an earlier knowledge of the “lords of the days,” and other writings indicate a still earlier use of the period of seven days, the first proved instance of the use of the name of a weekday is of the year A.D. 484, and is furnished by an inscription in the Saugor district, Central India.
The divisions of the civil day, as far as we need note them, are 60 vipalas = 1 pala = 24 seconds; 60 palas = 1 ghaṭikā = 24 minutes; Divisions of the day. 60 ghaṭikās = 24 hours = 1 day. There is also the muhūrta = 2 ghaṭikās = 48 minutes: this is the nearest approach to the “hour.” The comparative value of these measures of time may perhaps be best illustrated thus: 2½ muhūrtas = 2 hours; 2½ ghaṭikās = 1 hour; 2½ palas = 1 minute; 2½ vipalas = 1 second.
As their civil day begins at sunrise, the Hindus naturally count all their times, in ghaṭikās and palas, from that moment. But the moment is a varying one, though not in India to anything like the extent to which it is so in European Civil time. latitudes; and under the British Government the Hindus have recognized the advantage, and in fact the necessity, especially in connexion with their lunar calendar, of having a convenient means of referring their own times to the time which prevails officially. Consequently, some of the almanacs have adopted the European practice of showing the time of sunrise, in hours and minutes, from midnight; and some of them add the time of sunset from noon.
The lunar year consists primarily of twelve lunations or lunar months, of which the present Sanskṛit names, generally used in more or less corrupted forms, are Chaitra, Vaiśākha, &c., to Phālguna, as given above in connexion with the solar The lunar year. months. It is of two principal varieties, according as it begins with a certain day in the month Chaitra, or with the corresponding day in Kārttika: the former variety is conveniently known as the Chaitrādi year; the latter as the Kārttikādi year. For religious purposes the lunar year begins with its first lunar day: for civil purposes it begins with its first civil day, the relation of which to the lunar day will be explained below. Owing to the manner in which, as we shall explain, the beginning of the lunar year is always shifting backwards and forwards, it is not practicable to lay down any close equivalents for comparison: but an indication may be given as follows. The first civil day of the Chaitrādi year is the day after the new-moon conjunction which occurs next after the entrance of the sun into Mīna, and it now falls from about 13th March to about 11th April: the first civil day of the Kārttikādi year is the first day after the new-moon conjunction which occurs next after the entrance of the sun into Tulā, and it now falls from about 17th October to about 15th November.
The present names of the lunar months, indicated above, were derived from the nakshatras, which are certain conspicuous stars and groups of stars lying more or less along the neighbourhood of the ecliptic. The nakshatras are regarded The lunar month. sometimes as twenty-seven in number, sometimes as twenty-eight, and are grouped in twelve sets of two or three each, beginning, according to the earlier arrangement of the list, with the pair Kṛittikā and Rōhiṇī, and including in the sixth place Chitrā and Svāti, and ending with the triplet Rēvatī, Aśvinī and Bharaṇī. They are sometimes styled lunar mansions, and are sometimes spoken of as the signs of the lunar zodiac; and it is, no doubt, chiefly in connexion with the moon that they are now taken into consideration. But they mark divisions of the ecliptic: according to one system, twenty-seven divisions, each of 13 degrees 20 minutes; according to two other systems, twenty-seven or twenty-eight unequal divisions, which we need not explain here. The almanacs show the course of the sun through them, as well as the course of the moon; and the course of the sun was marked by them only, before the time when the Hindus began to use the twelve signs of the solar zodiac. So there is nothing exclusively lunar about them. The present names of the lunar months were derived from the nakshatras in the following manner: the full-moon which occurred when the moon was in conjunction with Chitrā (the star α Virginis) was named Chaitrī, and the lunar month, which contained the Chaitrī full-moon, was named Chaitra; and so on with the others. The present names have superseded another set of names which were at one time in use concurrently with them; these other names are Madhu (= Chaitra), Mādhava, Śukra, Śuchi, Nabhas, Nabhasya, Isha, Ūrja (= Kārttika), Sahas, Sahasya, Tapas, and Tapasya (= Phālguna): they seem to have marked originally solar season-months of the solar year, rather than lunar months of the lunar year.
A lunar month may be regarded as ending either with the new-moon, which is called amāvāsyā, or with the full-moon, which is called pūrṇamāsī, pūrṇimā: a month of the former kind is termed amānta, “ending with the new-moon,” or śuklādi, “beginning with the bright fortnight;” a month of the latter kind is termed pūrṇimānta, “ending with the full-moon,” or kṛishṇādi, “beginning with the dark fortnight.” For all purposes of the calendar, the amānta month is used in Southern India, and the pūrṇimānta month in Northern India. But only the amānta month, the period of the synodic revolution of the moon, is recognized in Hindu astronomy, and for the purpose of naming the lunations and adjusting the lunar to the solar year by the intercalation and suppression of lunar months; and the rule is that the lunar Chaitra is the amānta or synodic month at the first moment of which the sun is in the sign Mīna, and in the course of which the sun enters Mēsha: the other months follow in the same way; and the lunar Kārttika is the amānta month at the first moment of which the sun is in Tulā, and in the course of which the sun enters Vṛiśchika. The connexion between the lunar and the solar months is maintained by the point that the name Chaitra is applied according to one practice to the solar Mīna, in which the lunar Chaitra begins, and according to another practice to the solar Mēsha, in which the lunar Chaitra ends. Like the lunar year, the lunar month begins for religious purposes with its first lunar day, and for civil purposes with its first civil day.
One mean lunar year of twelve lunations measures very nearly 354 days 8 hrs. 48 min. 34 sec.; and one Hindu solar year measures 365 days 6 hrs. 12 min. 30 sec. according to Āryabhaṭa, or slightly more according to the other two authorities. Consequently, the Intercalation and suppression of lunar months. beginning of a lunar year pure and simple would be always travelling backwards through the solar year, by about eleven days on each occasion, and would in course of time recede entirely through the solar year, as it does in the Mahommedan calendar. The Hindus prevent that in the following manner. The length of the Hindu astronomical solar month, measured by the saṁkrāntis of the sun, its successive entrances into the signs of the zodiac, ranges, in accordance with periodical variations in the speed of the sun, from about 29 days 7 hrs. 38 min. up to about 31 days 15 hrs. 28 min. The length of the amānta or synodic lunar month ranges, in accordance with periodical variations in the speed of the moon and the sun, from about 29 days 19 hrs. 30 min. down to about 29 days 7 hrs. 20 min. Consequently, it happens from time to time that there are two new-moon conjunctions, so that two lunations begin, in one astronomical solar month, between two saṁkrāntis of the sun, while the sun is in one and the same sign of the zodiac, and there is no saṁkrānti in the lunation ending with the second new-moon: when this is the case, there are two lunations to which the same name is applicable, and so there is an additional or intercalated month, in the sense that a name is repeated: thus, when two new-moons occur while the sun is in Mēsha, the lunation ending with the first of them, during which the sun has entered Mēsha, is Chaitra; the next lunation, in which there is no saṁkrānti, is Vāiśākha, because it begins when the sun is in Mēsha; and the next lunation after that is again Vaiśākha, for the same reason, and also because the sun enters Vṛishabha in the course of it: in these circumstances, the first of the two Vaiśākhas is called Adhika-Vaiśākha, “the additional or intercalated Vaiśākha,” and the second is called simply Vaiśākha, or sometimes Nija-Vaiśākha, “the natural Vaiśākha.” On the other hand, it occasionally happens, in an autumn or winter month, that there are two saṁkrāntis of the sun in one and the same amānta or synodic lunar month, between two new-moon conjunctions, so that no lunation begins between the two saṁkrāntis: when this is the case, there is one lunation to which two names are applicable, and there is a suppressed month, in the sense that a name is omitted: thus, if the sun enters both Dhanus and Makara during one synodic lunation, that lunation is Mārgaśira, because the sun was in Vṛiśchika at the first moment of it and enters Dhanus in the course of it;[2] the next lunation is Māgha, because the sun is in Makara by the time when it begins and will enter Kumbha in the course of it; and the name Pausha, between Mārgaśira and Māgha, is omitted. When a month is thus suppressed, there is always one intercalated month, and sometimes two, in the same Chaitrādi lunar year, so that the lunar year never contains less than twelve months, and from time to time consists of thirteen months. There are normally seven intercalated months, rising to eight when a month is suppressed, in 19 solar years, which equal very nearly 235 lunations;[3] and there is never less than one year without an intercalated month between two years with intercalated months, except when there is only one such month in a year in which a month is suppressed; then there is always an intercalated month in the next year also. The suppression of a month takes place at intervals of 19 years and upwards, regarding which no definite statement can conveniently be made here. It may be added that an intercalated Chaitra or Kārttika takes the place of the ordinary month as the first month of the year; an intercalated month is not rejected for that purpose, though it is tabooed from the religious and auspicious points of view.
The manner in which this arrangement of intercalated and suppressed months works out, so as to prevent the beginning of the Chaitrādi lunar year departing far from the beginning of the Mēshādi solar year, may be illustrated as follows. In A.D. 1815 the Mēsha-saṁkrānti occurred on 11th April; and the first civil day of the Chaitrādi year was 10th April. In A.D. 1816 and 1817 the first civil day of the Chaitrādi year fell back to 29th March and 18th March. In A.D. 1817, however, there was an intercalated month, Śrāvaṇa; with the result that in A.D. 1818 the first civil day of the Chaitrādi year advanced to 6th April. And, after various shiftings of the same kind—including in A.D. 1822 an intercalation of Āśvina and a suppression of Pausha, followed in A.D. 1823, when the first civil day of the Chaitrādi year had fallen back to 13th March, by an intercalation of Chaitra itself—in A.D. 1834, when the Mēsha-saṁkrānti occurred again on 11th April, the first civil day of the Chaitrādi year was again 10th April.
The lunar month is divided into two fortnights (paksha), called bright and dark, or, in Indian terms, śukla or śuddha, śudi, sudi, and kṛishṇa or bahula, badi, vadi: the bright fortnight, śukla-paksha, is the period of the waxing moon, ending The lunar fortnight. at the full-moon; the dark fortnight, kṛishṇa-paksha, is the period of the waning moon, ending at the new-moon. In the amānta or śuklādi month, the bright fortnight precedes the dark; in the pūrṇimānta or kṛishṇādi month, the dark fortnight comes first; and the result is that, whereas, for instance, the bright fortnight of Chaitra is the same period of time throughout India, the preceding dark fortnight is known in Northern India as the dark fortnight of Chaitra, but in Southern India as the dark fortnight of Phālguna. This, however, does not affect the period covered by the lunar year; the Chaitrādi and Kārttikādi years begin everywhere with the bright fortnight of Chaitra and Kārttika respectively; simply, by the amānta system the dark fortnights of Chaitra and Kārttika are the second fortnights, and by the pūrṇimānta system they are the last fortnights, of the years. Like the month, the fortnight begins for religious purposes with its first lunar day, and for civil purposes with its first civil day.