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About twenty millennia ago, there was a cataclysm of galactic proportions. From this common reference point, a Sidereal date and time system has been calculated that allows the chronicling of events that may happen thousands of light-years apart.
The easiest way to understand Sidereal dates and times is to compare them with those we are familiar with...
| Terrestrial Time/Date | Sidereal Time/Date |
| 1 Minute=60 Seconds | 1 Minute=100 Seconds |
| 1 Hour=60 minutes | 1 Hour=100 Minutes Sidereal(2 Hrs. 47 Min. Terrestrial) |
| 1 Day=24 Hours | 1 Day=10 Hours Sidereal(1 Day, 3 Hrs. 47 Min. Terr.) |
| 1 Week=7 Days | 1 Week=6 Days Sidereal(6 Days, 22 Hrs. 40 Min. Terr.) |
| 1 Month=28-31 Days | 1 Month=30 Days Sidereal (34 Days, 17 Hrs. 20 Min. Terr.) |
| 1 Year=12 Months | 1 Year=10 Months Sidereal (347 Days, 5 Hrs. 20 Min. Terr.) |
Time and date entries are made in the following manner...
| Year/Month/Day - Hr:Min:Sec |
| 19783/9/22 - 4:71:89 |
In Corona Galaxy stories and scenarios, SD or Sidereal Date is used as a point of reference. Most entries will have the SY or Sidereal Year listed in the intro. Days, minutes, weeks, etc. will usually be generic or their exact length unimportant to the situation. Where a time reference is specific, it will usually be labeled as being sidereal or local.
