day *****
twenty-four hours
twenty-four hour period
24-hour interval
solar day
mean solar day

A modern computer model gives 365 solar days, 5 hours 49 minutes 19 seconds.

Also, the mean solar day is getting longer at a rate of about 1.5 ms per 100 tropical years.

I've given him two solar days to come up with some kind of a solution.

It tends to run with a period different from that of a solar day!

Consequently, solar days are not the same length throughout the year.

There are 365.2424 solar days in the mean tropical year.

"All the damage reports aren't in yet, but my guess is at least a solar day's work."

Other types of calendar may also use a solar day.

A solar day is approximately 24 hours of mean time.

A solar day on Mars is 24 hours 39 minutes 35.244 seconds.