2,DATETIME,DATETIME,MJD2K,DOUBLE,Time of the sky camera measurement; defined relative to reference datetime of Jan. 1 2000 at 0:00:00 UT which is equal to 0.00,x
2,LATITUDE.INSTRUMENT,CONSTANT|DATETIME],deg,REAL,Inst. geolocation. Latitude north (decimal degrees) of the location of the instrument (+ for north; - for south),x
2,LONGITUDE.INSTRUMENT,[CONSTANT|DATETIME],deg,REAL,Inst. geolocation. Longitude east (decimal degrees) of the location of the instrument (+ for east; - for west),x
2,ALTITUDE.INSTRUMENT,[CONSTANT|DATETIME],m,REAL,Inst. geolocation. Altitude of the instrument,x
2,CLOUD.FRACTION,DATETIME,1,REAL,Fraction of the image containing cloud,x
