Sharing astrononomy information, references, pictures and tools
Web Links Of Value
Web links to Lists And References for Astronomical Objects

Ngc/IC Project - Fantastic site to get pictures of the NGC or IC objects easily.

Astronomical League   Large number of organized observing projects for ideas or earning cirtificate/pins.

SAC Observing Lists - Saguaro collection of many fine lists and also see their astro links.

Heavens Above Sattelite And Space Station tracking information and astroids/comets as well

Adventures In Deep Space - Advanced collection of astronomical targets and projects for visual observers.

WikiSky - Deep images of full sky with object search. Remarkable

SkyView Query:  Image search frontend: Powerful and serious image searches

Solar Activity:  SolarHam site is loaded with current info.  Daily condition pictures at SolarMonitor

Supernovae Lists:  CBAT list from Harvard and  from Rochester Astronomy with some pictures

Measurements And Calculations Used In Astronomy

Telescope Formulas   -  Also see this link for common formulas for visual and astrophotography math.

Star Testing Of Optics -  Shows star test patterns that are from excellent to bad showing common problems

Collimation - Sky and Telescope on Newtonian collimation.  And SCT collimation  by Thierry Legault.

SkyQuality meter measures magnitude per Arc Second.  Learn about magnitude  per ArcSec

Limiting Magnitude Calculator - Calculate expected limited magnitude for the telescope, sky, observer

Atmospheric Effects - Extinction (loss of magnitude due to atmosphere) and Refraction is explained nicely

Image Scale Calc  -  Enter telescope and CCD sensor specs and calculate arcSec per Pixelsearchs