Why do stars twinkle while planets usually shine steadily?
How moving air changes starlight, why a planetary disk smooths fluctuations, and when planets twinkle too. Explore the averaging model.
Tag archive
#observation
Articles: 3
Why don't solar and lunar eclipses happen every month?
Two orders of bodies, umbra and penumbra, orbital nodes and a lunar-shadow model: why new and full Moon are not enough for an eclipse, and how to observe safely.
Why does the Moon keep changing shape?
Why we see crescents, half a disk and full Moon: explore lunar phases with an adjustable diagram and a lamp experiment, and test the shadow explanation.