lecture3 - Cycle of the Sky To understand the apparent...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Cycle of the Sky To understand the apparent motions of celestial objects To introduce the seasons So MANY objects.How Do We Make Sense of it ALL?? The Sun is physically 400 times larger than the Moon. Why is their angular size is the same? Angle diameter (in radians) = diameter/distance Full circle = 2 (in radians)=360 degrees=360 o 1 o =60 arminutes = 60 1 = 60 arcseconds = 60 Angular Size Some Examples: Horizon to zenith (point overhead) 90 o Your fist at arm's length 10 o Your fingernail at arm's length 1 o = 60' Sun or Moon seen from Earth 0.5 o = 30' Smallest detail visible to naked eye 1' = 60'' Smallest detail visible by a single telescope from Earth's surface: 1'' Angular size of Pluto: 0.15 Betelgeuse (largest star) seen from Earth 0.004'' Constellations 88 official constellations divide the sky into areas with clearly boundaries. The names of constellations are in Latin. But most bright star names derived from ancient Arabic....
View Full Document

This note was uploaded on 05/19/2008 for the course ASTRON 100 taught by Professor Minyun during the Spring '08 term at UMass (Amherst).

Page1 / 30

lecture3 - Cycle of the Sky To understand the apparent...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online