A time diagram is a diagram on the plane of...

Question 1 / 27070

Question 1 of 2707066636ee928f7522a1c51a311

A time diagram is a diagram on the plane of the __________.

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Question 1 of 27070

Q

A time diagram is a diagram on the plane of the __________.

🔍 Key Concepts

• time diagram in celestial navigation • relationship between hour angle and the reference great circle • how celestial coordinates are projected onto a 2‑D plane for time problems

💭 Think About

• Which great circle is commonly used as the fundamental reference for measuring hour angle in celestial navigation? • When you draw a time diagram, what are you usually plotting against time: right ascension/declination, or hour angle along a specific reference circle? • Ask yourself which of these circles provides a natural, continuous 0°–360° reference for tracking apparent daily motion of celestial bodies.

✅ Before You Answer

• Identify which option is the primary reference circle for Greenwich Hour Angle (GHA) and Local Hour Angle (LHA). • Verify which circle lies at 90° to the celestial poles and spans 360°, making it convenient for time-based angular measurements. • Eliminate any circles that are primarily used for altitude/azimuth or for defining a single observer’s local position rather than global time references.