The Astronomy Thread

davu

Ad Honorem
Jun 2010
4,078
Retired - This Mountain isn't on a Map
Ancient Astronomers Were No Fools

Ancient Astronomers Were No Fools - News from Sky & Telescope - SkyandTelescope.com

There’s no doubt ancient astronomers were clever folk. Realizing Earth was round, estimating the Sun’s distance, discovering heliocentricity — it’s quite a list. But Brad Schaefer (Louisiana State University) suggested at the recent American Astronomical Society meeting in Austin that we should add another light bulb to the glow shining from history: ancient astronomers may have corrected for dimming caused by the atmosphere, centuries before anyone came up with a physical model for it.
 

davu

Ad Honorem
Jun 2010
4,078
Retired - This Mountain isn't on a Map
Megaliths, Myths and Men: An Introduction to Astro-Archaeology

[ame="http://www.amazon.com/Megaliths-Myths-Men-Introduction-Astro-Archaeology/dp/0486411451/ref=sr_1_sc_2?s=books&ie=UTF8&qid=1327683784&sr=1-2-spell"]Amazon.com: Megaliths, Myths and Men: An Introduction to Astro-Archaeology (9780486411453): Peter Lancaster Brown: Books@@AMEPARAM@@http://ecx.images-amazon.com/images/I/41CHxIs5YhL.@@AMEPARAM@@41CHxIs5YhL[/ame]

Exploring Ancient Skies: A Survey of Ancient and Cultural Astronomy

[ame="http://www.amazon.com/Exploring-Ancient-Skies-Cultural-Astronomy/dp/144197623X/ref=pd_vtp_b_15"]Amazon.com: Exploring Ancient Skies: A Survey of Ancient and Cultural Astronomy (9781441976239): David H. Kelley, Eugene F. Milone, A.F. Aveni: Books@@AMEPARAM@@http://ecx.images-amazon.com/images/I/41UIdEUHcmL.@@AMEPARAM@@41UIdEUHcmL[/ame]
 

unclefred

Ad Honorem
Dec 2010
6,731
Oregon coastal mountains
About Newgrange:

The Light-box/Roof-box - [FONT=Verdana, Arial, Helvetica]Above the entrance passage is a 'light-box', which precisely aligns with the rising sun at the winter solstice of 21st December, so that the rays touch the ground at the very centre of the tomb for about 20 minutes. Many of the upright stones along the walls of the 19m (62ft) passage, which follows the rise of the hill, are richly decorated.[/FONT]




The light-box combines with other design features so that the light is narrowed with the result that a small 'dagger' of light slides along the floor of the passage towards the inner chamber, where it illuminates it for 17 minutes a year.

http://www.ancient-wisdom.co.uk/irelandnewgrange.htm
 
Jan 2010
2,974
Incline Village near Lake Tahoe
hello all, it is 09:26hrs here in Incline Village.

They even knew of the Precession of The Equinoxes. http://en.wikipedia.org/wiki/Axial_precession_(astronomy)

It was discovered by Hipparchus around 162 to 127 BC. [ame=http://en.wikipedia.org/wiki/Hipparchus]Hipparchus - Wikipedia, the free encyclopedia[/ame]



This eventually led to the correct determination of the Polar Stars and Ursa Major, The length of the year, The Spring Equinox telling them when to plant; and to fixing the zodiac.


 
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davu

Ad Honorem
Jun 2010
4,078
Retired - This Mountain isn't on a Map
Island of the Setting Sun: In Search of Ireland's Ancient Astronomers


[ame="http://www.amazon.com/Island-Setting-Sun-Irelands-Astronomers/dp/190578547X/ref=sr_1_3?s=books&ie=UTF8&qid=1327685344&sr=1-3"]Amazon.com: Island of the Setting Sun: In Search of Ireland's Ancient Astronomers (9781905785476): Anthony Murphy, Richard Moore: Books@@AMEPARAM@@http://ecx.images-amazon.com/images/I/51ErFhkOb8L.@@AMEPARAM@@51ErFhkOb8L[/ame]