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#### EvilDrGanymede

##### Guest

You actually need to multiply the year length by an additional factor of:

Square root of [1/(mass ratio of the star to Sol's mass)].

So a planet (in any orbit) orbiting a star half as massive as Sol (e.g. an M0 V) will have a year that is a factor of SQRT(1/0.5) = SQRT(2) = x1.414 of the Year length modifier shown in the table on p374.

A planet orbiting a star twice as massive as Sol (e.g. an A5 V) will have an additional year length modifier of SQRT (1/2) = x0.707. Thus, it completes one orbit more quickly than a planet orbiting the same distance from Sol, which is what you'd expect.

Of course, you aren't presented with a table of stellar masses in T20, so this is kinda moot, I guess :/.