This is the time when the sun passes from one sign of the zodiac to the next, it is the start of the new month in the Indian calendar. The beginning of the new month is announced in the gurdwaras by the reading of portions of Bara Maha, Song of the 12 Months, by Guru Arjan (pg. 133) or sometimes Bara Maha by Guru Nanak (pg. 1107). This day just marks the beginning of the new month and is not treated as being greater or better than any other day.