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Latitude
The angular distance north or south of the equator measured along a meridian passing through a point on the surface of a planet. Hence, also a north-south coordinate. |
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LCT
Abbreviation for Local Civil Time. This is time according to the time zone in use at a particular location, if any, including advanced time, if used. |
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Leap year
A year distinguished from a common year by its inclusion of one or more extra days. Most commonly, solar calendars distinguish a common year of 365 days and a leap year of 366 days. The term "leap" is derived from the saltus or jump in dominical letters that identify years in medieval paschal tables. |
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LMT
Abbreviation for Local Mean Time. This is time that is correct according to the mean sun at a particular location. This time differs from UTC or GMT by a time zone adjustment and an adjustment for actual geographical latitude. |
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Longitude
The angular distance, measured east or west along the equator from the Greenwich meridian to a meridian passing through a particular point on the surface of the Earth. Hence, also an eastwest coordinate. |
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LQ
Abbreviation for Last Quarter. |
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Lunisolar
Adjective, typically used with reference to calendars that attempt to account for both lunar and solar motion. |
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Matins
The last watch of the night in the medieval monastery system. Denotes the time two hours before sunrise. |
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Mean sun
A fictitious body moving at a uniform rate along the Earth's equator. |
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Mean Solar Day (MSD)
See Day, mean solar. |
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Megalith
A stone of great size. In particular, stones used to construct monuments and other structures, some of which are related to astronomical observation and calendrics. |
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Menhir
Breton for "long stone". A tall and upright stone serving as a monument or position marker. Some were erected to mark astronomical events. The erection dates of many are not known. |
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Metonic rule
A relationship, the discovery of which was credited to Meton, an astronomer of Athens, in which the period of 235 lunations is almost equal to 19 solar years. |
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