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How many light-day in 1 Mm? The answer is 3.8606955462749E-8. We assume you are converting between light day and megametre. You can view more details on each measurement unit: light-day or Mm The SI base unit for length is the metre. 1 metre is equal to 3.8606955462749E-14 light-day, or 1.0E-6 Mm. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between light days and megameters. Type in your own numbers in the form to convert the units!
1 light-day to Mm = 25902068.3712 Mm
2 light-day to Mm = 51804136.7424 Mm
3 light-day to Mm = 77706205.1136 Mm
4 light-day to Mm = 103608273.4848 Mm
5 light-day to Mm = 129510341.856 Mm
6 light-day to Mm = 155412410.2272 Mm
7 light-day to Mm = 181314478.5984 Mm
8 light-day to Mm = 207216546.9696 Mm
9 light-day to Mm = 233118615.3408 Mm
10 light-day to Mm = 259020683.712 Mm
You can do the reverse unit conversion from Mm to light-day, or enter any two units below:
A light day (also written light-day) is a unit of length. It is defined as the distance light travels in an absolute vacuum in one day (of 86,400 seconds) or 25,902,068,371,200 metres (~26 Tm).
Note that this value is exact, since the metre is actually defined in terms of the speed of light. The light day isn't very frequently used at all since there are few astronomical objects or distances of that magnitude; the Oort cloud, for example, is thought to extend between 290 and 580 light-days out from the Sun.
A megametre (American spelling: megameter, symbol: Mm) is a unit of length equal to 10^6 metres (from the Greek words megas = big and metro = count/measure). Its customary equivalent is 621.37 miles.
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