North Node Calculator
The lunar nodes are the two points where the Moon's orbit crosses the ecliptic, and they sit exactly opposite each other, so one calculation gives both. Enter a birth date, a clock time and the UTC offset of the birth place, and this returns the North Node and the South Node by sign and degree, the dates the axis moved into and out of that sign, and the calendar dates of the first four nodal returns. It uses the mean node, whose position the true node wanders around by up to about 1.7 degrees, and it says which it is used on every result. The node barely moves in a day and is the same everywhere on Earth, so no birthplace is needed and a rough birth time is fine.