Read Moon phases
This SOF ISO pattern tests illuminated sides and phases. Read the condition carefully, then use the method below before you solve.
Moon phases is the central idea in this question pattern. Identify the condition in the stem before applying the method below.
Keep the Sun, Earth and Moon positions separate
Position and motion create the observed pattern
Rotation explains day and night; revolution changes Earth’s position around the Sun. Eclipses and phases depend on the viewing geometry.
Find the tested idea
Write down the quantities, directions or conditions given in the stem before selecting a formula or rule.
Work from the evidence
Use one governing relationship at a time. For a visual question, trace the path; for a numerical question, keep units and signs consistent.
Verify before choosing
Use the wording, diagram and units exactly as given. Select an option only after it satisfies every stated condition.
OlympIQ exam lens
- ✓Extract the condition.
- ✓Apply one governing rule.
- ✓Check sign, unit or direction.
Check the result against a simple limiting case, diagram direction or unit before choosing an option.
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