The unit "milissecond" is a common misspelling for millisecond.
Full name: millisecond
Plural form: milliseconds
Symbol: ms
Alternate spelling: millisec
Category type: time
Scale factor: 0.001
The SI base unit for time is the second.
1 second is equal to 1000 milissecond.
Valid units must be of the time type.
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The SI prefix "milli" represents a factor of 10-3, or in scientific notation, 1E-3.
So 1 millisecond = 10-3 arcseconds.
The definition of a second is as follows:
A second of arc or arcsecond is a unit of angular measurement which comprises one-sixtieth of an arcminute, or 1/3600 of a degree of arc or 1/1296000 (approximately 7.7×10-7) of a circle. It is the angular diameter of an object of 1 unit diameter at a distance of 360×60×60/(2pi) (approximately 206,265 units), such as (approximately) 1 cm at 2.1 km, or, directly from the definition, 1 astronomical unit at 1 parsec.
