At meridian transit, the diagram used by a navigator to illustrate the angles involved is based on the __________.
⢠Meridian transit ā when a celestial body crosses the observerās local meridian (the northāsouth line through the observer) ⢠How altitude and declination are shown in a meridian altitude diagram ⢠Difference between a diagram based on a global reference (like Greenwich) and a local reference (the observer)
⢠Ask yourself: At meridian transit, are we mainly concerned with a global reference meridian (like Greenwich), the celestial equator from a pole, or the observerās own northāsouth line? ⢠Which choice best describes the geometric plane that contains both the observerās zenith and the celestial poles? ⢠When you draw the altitude of the Sun or a star at LAN (local apparent noon), what line on your sketch does the body cross?
⢠Identify which option refers to the observerās own meridian, not a distant or global reference meridian ⢠Confirm that meridian transit is about the body crossing the local northāsouth great circle, not the equator itself ⢠Eliminate options that only describe a viewpoint (e.g., "as observed from above a pole") rather than the geometric plane used for the altitude diagram
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