reference meridian

reference meridian

reference meridianclick for a larger image
reference meridianclick for a larger image
That selected to establish grid north or local time.
References in periodicals archive ?
The direction of the IERS Reference Pole (IRP) and IERS Reference Meridian (IRM) corresponds to the Bureau International de L'Heure (BIH) Conventional Terrestrial System (CTS) Pole and Zero Meridian (McCarthy, 1996).
The orientation of the IERS Reference Pole (IRP) and Reference Meridian (IRM) were initially based on the BIH Terrestrial System (BTS) 1984.
Swatch has manufactured its Beat watches despite the convoluted conversion involving a change in the reference meridian from Greenwich, England, to Biel, Switzerland (Swatch's home): "Webmaster," "Download," and "Net-time" will divide the day into 1,000 time-zone-free beats lasting 86.

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