The Sun · Observing
Analemma
Say it: an-uh-LEM-uh IPA: /ˌænəˈlɛmə/ noun
Analemma: The pattern of the Sun's position when recorded at the same mean solar clock time throughout a year.
From a fixed place on Earth, those positions make a tilted figure eight. Earth's tilted axis and uneven orbital speed both contribute to its shape.
- Example
- A year of solar positions plotted at the same clock time formed an analemma.
- Why astronomers use it
- It connects the changing position of the Sun with the difference between clock time and sundial time.
- Tiny cosmic connection
- Keep the clock convention fixed: a daylight-saving change would shift the sampling time. Never look directly at the Sun to trace it.
Observatory The Sun Observing
Where to check it
Written for Cool Moon Facts in its own words; the sources cover the same idea in more depth.