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Prathamai is the the first tithi after Amavasai of either Sukla paksha or Krishna paksha. Sukla paksham prathamai indicates the start of a new month, which ends with the next cycle of Pournami till Amavasai [Krishna paksham].
Those that are born on the prathamai tithi are interested in activities or professions that require a certain dexterity of hand and a keen mind. They are keen observers and have a sharp mind. They choose a profession or a hobby that feeds both their mental and physical skills.
They are generally concerned about others and are a principled lot, with an abiding interest in paranormal phenomenon.
A person born on this tithi is of good nature but does not get to enjoy life. It is better to avoid unnecessary contact with others on this day, especially if you do not know them. Person born on this tithi might have a scandal or two in a lifetime. Nature of this tithi is vriddhi. Anyone born on the prathamai tithi will be blessed with a good spouse and children.
Prathamai is not ideal for religious ceremonies, marriages, auspicious functions and rituals. Travel is not at all recommended. Construction on this tithi is not advised.
Prathamai is ruled by the Surya, division is Nanda, deity is Brahma. If Prathamai falls on a friday, it is considered an auspicious day.