How would the tides on earth be different if the moon revolved around the earth in 15 days instead of 30 days?

Answer 1

Well, first of all, the moon revolves around the Earth every 27.3 days, not 30, and we see

a complete cycle of "phases" every 29.53 days.

-- Right now, the tides go high -- low -- high -- low every 24hours 49minutes on the

average, so each extreme follows the preceding extreme by about 6hours 12minutes.

-- If the moon revolved in the same direction but in half the time, then each extreme

would follow the preceding extreme by about 6 hours 24 minutes, with the complete

"daily" cycle averaging 25 hours 36 minutes.

Of course the high tides would be higher and the lows would be lower, because

in order to revolve around the Earth more often, the moon would need to be in

a smaller orbit.