Chitra (nakshatra) in the context of Vedanga Jyotisha

In Ancient Indian astronomy, there are 27 nakshatras, or sectors along the ecliptic. A list of them is first found in the Vedanga Jyotisha, a text dated to the final centuries BCE. The nakshatra system predates the influence of Hellenistic astronomy on Vedic tradition, which became prevalent from about the 2nd century CE. There are various systems of enumerating the nakshatras; although there are 27–28 days to a sidereal month, by custom only 27 days are used. The following list gives the corresponding regions of sky. Months in the modern Indian national calendar, which is based on the traditional "nirayana" sidereal calendar, are named after twelve of the nakshatras, but do not coincide with the times when the sun is passing through these nakshatras - in fact, they are close to the opposite. It is possible that during the original naming of these months—whenever that happened—they were based on the position of the Full Moon (opposite the Sun). The modern Indian national calendar is a solar calendar, much like the Gregorian calendar, wherein solstices and equinoxes fall on the same date(s) every year.