ASTR 101 Lecture Notes - Lecture 1: Winter Solstice, Solar Time, Equinox

39 views3 pages
28 Feb 2018
School
Department
Course
Professor

Document Summary

Astronomical scales are very hard to grasp, sun is 93 million miles away from the earth, galaxies: scale is way larger (100,000 light years, or 1000 quadrillion kilometers). What is a light year: the distance light takes to travel 1 year, speed of light: c = 300,000 km per second, 3 x 10^5 km per second, or 3 x 10^8. Light year (ly) m per second: seconds in a year: 1 year | 365 days |24 h | 60 min | 60 sec | = pi x 10 ^7 seconds, or 3. 14 x 10^7 seconds. 1 year | 1 day| 1 hour | 1 min : d = v x t. = 3. 1^5 km/s x pi x 10^7 seconds. Celestial sphere: north and south: celestial pole, equator, the world moves to the right. Seasons: the distances between the earth and sun decides the temperature/season along with the solstice/equinox, ex: winter/summer solstice vs. vernal/autumnal equinox, vernal equinox: mar.

Get access

Grade+20% off
$8 USD/m$10 USD/m
Billed $96 USD annually
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
40 Verified Answers
Class+
$8 USD/m
Billed $96 USD annually
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
30 Verified Answers

Related Documents