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начальный меридиан stresses
astronaut.	prime meridian
cartogr.	principal meridian; initial meridian
cartogr., amer.	central meridian (в системе координат штата)
cartogr., obs.	basis meridian
construct.	initial direction; reference direction
geogr.	meridian of Greenwich
geophys.	reference meridian; standard meridian
Makarov.	base meridian; meridian of origin
mil.	basic meridian
nautic.	first meridian; primary meridian; zero meridian; Greenwich meridian
navig.	International meridian; null meridian

начальный меридиан: 5 phrases in 3 subjects

Geophysics	3
Nautical	1
Navigation	1