Ron Torell, former University of Nevada Extension livestock specialist now retired, wrote a few years back that most cows pay for themselves by age six. âThus, the longer a cow stays in the herd, the more profitable she becomes.
Naturally, these hours, minutes, and seconds are shorter than the solar hours, minutes, and seconds you are familiar with. One solar day is 24 solar hours long, and one sidereal day is 24 sidereal hours long, but one sidereal day is 23 solar hours and 56 solar minutes long. This exercise was based on a help section of CyberSky. A shareware version of CyberSky is available from http://www.cybersky.com .
1 The sidereal month is defined as the Moon's orbital period in a non-rotating frame of reference (which on average is equal to its rotation period in the same frame). 2  It is about 27.32166 days (27 days, 7 hours, 43 minutes, 11.6 seconds).