Planetary body should be a new offset category/type that defaults to Earth. Instead of tracking time as time:offset:date:calendar, we should do time:offset:date

Planetary body should be a new offset category/type that defaults to Earth. Instead of tracking time as time:offset:date:calendar, we should do time:offset:date:calendar:planetTimeOffsetRatio. If calendarplanetTimeOffsetRatio is 1.02777778 (Mars:Earth days), number of seconds available in the day is increased by 2.777778%