Last updated February 7, 2013
The contents of each section below are sorted alphabetically (except New Links, which is sorted by date then alpha.) There are also a number of other greater Philadelphia area astronomy clubs and organizations which maintain web sites.
"Cozmic Ray" from the BMAA started a Philadelphia area Regional Astro Clubs Events page, which is a nice summary of evrything going on in all the area clubs.
Astronomy-related Magazine Sites
Sky & Telescope (Sky Publishing)
Astronomy Now is the UK's best-selling monthly astronomy magazine.
Amateur Astronomy - a quarterly B&W format magazine dedicated to amateurs.
Absolute Astronomy is a commercial site that sells those handy-dandy poly "screw bolt" style eyepiece cases that Meade 4000 Plössls come in, as well as other interesting things.
ASTROMART Home Page - Check out their classifieds section.
Astronomical Dealers on the Web is Bill Nunnelee's very comprehensive listing of the web sites of Astronomy-related vendors.
Astronomy-Mall - A commercial site which includes Lumicon and many others.
Astronomy Ratings is an unusual site that asks visitors to rate various pieces of equipment they use and keeps a running total of the voting with user comments.
High Point Scientific is a new northeastern vendor, some employees are former Pocono Mountain people.
Distant Suns Yet another interesting astronomical program for your computer.
Island Meteorites - Rare, historic, and unique meteorites for sale to researchers and collectors.
Project Pluto - makers of Guide, my favorite full-featured star charting and desktop planetarium program.
Rigel Systems - makers of the coolest LED flashlights and zero-power finders.
Skies Unlimited - a local full service astronomy vendor.
Televue - The "Rolls Royce" eyepiece company.
Willman-Bell, Inc. - perhaps the best source of books about astronomy for amateurs. They also have software and hardware for the "CCD Cookbook" cameras.
Astronomy and Space News
ExoScience Astronomy - Current space and astronomy news, updated daily.
Universe Today - "Space Exploration News from Around the Internet."
Jim's Astrophotography Page - primer and lots of other information
Polar Image - lots of interesting images by Finnish native Pekka Parviainen.
The Astrophoto Lab - Astrophotolab specializes in high quality photographic prints of public domain astronomical objects from the Hubble telescope, the Spitzer Infrared telescope and the Chandra X-ray observatory
For Amateur Telescope Makers
The 40 Pounder Project - possibly the lightest 16 inch f/5 alt-az telescope in the world!
Adventures in Collimation - lots of good "virtual pictures" of what you see during the collimation process
The ATM Page - a resource for both beginning and advanced Amateur Telescope Making.
Complete Plans for Building a Dobsonian Telescope
The Collimation - Lots of info about collimation, including generated images showing how mis-collimation degrades the view.
Stellafane Amateur Telescope Making Pages - a great source of information from "ATM prime."
AstroSystems Products - truss Dobsonian kits and ATM parts.
Crazy Ed Optical - odd and unusual parts and accessories.
Galaxy Optics - big mirrors and secondaries
Ken Dauzat's Rings 'n Things - lots of handy hardware including rings, brackets, balancing weights, etc.
MoonLite Telescope Accessories - Gorgeous crayford focusers and laser collimators.
Nova Optical Systems - big mirrors and secondaries
Optical Mechanics - big Newtonian and Cassegrain mirrors
Pegasus Optics - big mirrors and secondaries
ProtoStar Astronomy Products - produces a high quality line of diagonal mount assemblies and secondary mirrors for use in amateur telescopes.
Reid Tool Supply Company - Thousands of Tooling Components such as Handles, Handwheels, Knobs...
Spectrum Coatings - a place to get your new mirror coated (or your old mirror re-coated).
R.F. Royce - Mirrors, including conical section mirrors!
University Optics -- Reasonably priced eyepieces and cool ATM stuff.
Willman-Bell, Inc. - perhaps the best source of books about ATM and astronomy for amateurs. They also have software and hardware for the "CCD Cookbook" cameras.
The International Dark-Sky Association - if you're not a member, you should be.
The Pennsylvania Outdoor Lighting Council (POLC) - "The goal of the POLC is to reduce light pollution in Pennsylvania by educating the public about the safety and nuisance problems of obtrusive lighting and by recommending actions to improve outdoor lighting." Their home page has that depressing night-time satellite picture of Pennsylvania lit up like a Christmas tree.
Dark Sky Institute THE Dark Sky Institute (DSI) is Jack Troeger's personal and passionate venture to rescue the magnificent Milky Way from light pollution.
Sky & Tel's Light Pollution Page
An Article on Light Pollution by John Batinsey
A Light Pollution Fact Sheet from the Prarie Astronomy Club
Starry Night Lights offers the widest selection of ordinance compliant, night sky friendly outdoor lighting products for your home or business.
Lighting.com - an industry site which has some good articles and information
Bellacor sells many attractive and dark-sky-friendly outdoor lighting fixtures.
eLightSpot has a nice, thorough overview of light pollution and the terms used to describe it.
Unnecessary Lighting: All About Light Pollution - a suprisingly good discussion from a fan & lighting store web page.
Other lists of astronomical links...
The Astronomy Net
Mike Boschat's Astronomy Page - a gold mine of astronomical links
NASA / Space Science
LunarSat - "a spacecraft primarily designed and built by young professionals and students will investigate the Moon's suitability for an extraterrestrial outpost."
PDS - The Planetary Data System archives and distributes digital data from past and present NASA planetary missions, astronomical observations, and laboratory measurements.
Science@NASA - latest NASA scientific discoveries.
Space Place is a great place for kids to learn more about Earth, space and technology.
Odds 'n Ends
The Castle Point Astronomy Club site features a downloadable planets app which can predict all sorts of planetary events, including shadow transits.
Cherry Springs State Park: A Hidden Resource in the Dark - a history of the park, originally printed in State Parks magazine.
MapsOnUs Yet another online mapping service, but this one has a handy feature for astronomers: Once you locate an address, clicking on the map shows you the exact latitude and longitude of where you clicked.
Philadelphia Area Rocketry Association - the local chapter of the National Association of Rocketry, which is the "oldest and largest sport rocketry organization in the world."
The Science Lab site is a general science site which has a section on astronomy.
Star Message Screensaver - A screensaver for Wnidows, has the moon phases, the full moon names, famous quotes and other unusual info.
Arp's Catalog of Peculiar Galaxies - A comprehensive tabulation of Dr. Halton C. Arp's list of peculiar galaxies for the hardcore DSO.
Aurora Sentry is a collection of real time data helpful in determining whether there is aurora now and should give some insight to what might happen an hour from now.
Paul Markov's Deep Sky Observing Articles - lots of interesting and informative articles, all of which are short and digestible.
Ray Cash's Deep-Sky Page - lots of lists and observations
Hawaiian Astronomical Society Storybook and Deepsky Atlas - "the product of a long term effort to provide a good online atlas of the heavens, combined with photographs of significant objects, and their descriptions."
Hipparcos Data, a search engine for the famous data set -- Note that you MUST put in a Tolerance factor - 2 is usually good, and they recommend that you use a limiting magnitude as well.
Interactive NGC Catalog Online - the interactive NGC (and IC, and Messier) catalog at SEDS, based on the famous NGC 2000.0 by R.W. Sinnott of Sky Publishing Corp.
IOTA The International Occultation Timing Association - IOTA was established to encourage and facilitate the observation of occultations and eclipses, and provides means for those with the interest to do real science with simple equipment and methods.
JSRedshift Index - a great observing resource, lots of lists and info
Messier's Original Catalog - One of the most famous lists of Deep Sky Objects.
The list generator at Messier45.com has all kinds of DSO lists, including a number of object-type-specific links, e.g. 104 Open Cluster lists, 40 Globular Cluster lists, etc., plus a neat (if still evolving) Deep Sky Browser.
A description of the Phases of tyhe Moon - from QandA.
NED - the NASA/IPAC Extragalactic Database - a master list of extragalactic objects for which cross-identifications of names have been established, accurate positions and redshifts entered to the extent possible, and some basic data collected.
Open Cluster Maps - Published maps for open clusters, often of small apparent diameter, scanned and output in GIF format.
Planetary Nebulae Observer's Home Page - lots of info on Planetaries
The Saguaro Astronomy Club web site has two useful and free databases in ASCII text format: The Saguaro Astronomy Club's Deep Sky Database, Version 7.2 contains information on over 10,000 star clusters, galaxies, and nebulae of all types. The Double Star Database, Version 2.1 contains information on over 10,000 multiple star systems.
They also have a bunch of useful printouts including observing sheets, and a telescope checklist.
Sky Sgt's Astronomy Homepage - lots of links and information
SIMBAD - basic data, cross-identifications, observational measurements, and bibliography, for celestial objects outside the solar system: stars, galaxies, and nonstellar objects within our galaxy, or in external galaxies.
Sky Watch provides a personalized, on-line sky calendar by sending email to its subscribers about satellite passes that can be seen from their location. It also keeps them informed about meteor showers, eclipses and other sky news.
The Solar and Heliospheric Observatory Near-real-time images of the sun at many wavelengths as well as extensive information about the SOHO mission.
The Spirit of 33 is a interesting new "for fun" set of double star observing projects started by Spaniard Luis ArgŁelles. The idea is simple: Observe 33 double stars (of varying difficulty) from a specific constellation, and optionally, share your observations with the "33" community.
Sungazer.net - a site dedicated to solar observing.
Todd Gross' Weather and Astronomy Site
The June 2004 Transit of Venus page. The previous transit of Venus occurred on December 6, 1882 - one of merely five events of its kind ever watched by mankind.
USNO Data Services the place to find Sunrise, Sunset, Moonrise, Moonset, and Twilight, Phases of the moon, Eclipses, etc.
The WDS (WDS) maintained by the United States Naval Observatory is the world's principal database of astrometric double and multiple star information.
Other Astro Information
The AAVSO - American Association of Variable Star Observers
Akkana's Astronomy Page - An interesting site with a "shallow sky" slant.
Analemma.com An interesting and educational site that explains that wierd figure-eight you see on globes, and how it relates to the Equation of Time. Great demonstration movies.
The Antique Telescope Society - The "old scopes home", a site dedicated to antique telescopes, maintained by the DVAA's own Bart Fried.
AstroLair - a guide to amateur astronomy
Astronomy Boy - resources and tutorials for amateur astronomy
Astronomy In Your Hands - a site is devoted to hands-on astronomy activities, which contains lots of good material useful for promoting astronomy to beginners, including a free downloadable "star wheel" or planisphere.
The Astronomical Unit - Steve Tonkin's mostly astronmomy pages
AstroWeb A collection of pointers to astronomy-related information available on the Internet.
The Astronomy Cafe - "The web site for the astronomically disadvantaged".
The Astronomical League - The World's Largest Federation of Amateur Astronomers
The Astronomical Society of the Pacific - The RealSky people, the ASP's earliest purpose was to disseminate astronomical information; it has become the largest general astronomy society in the world.
The Constellations - All kinds of information relating to the 88 constellations
Cosmic Voyage - "The Online Resource for Amateur Astronomers"
Dark Sky Amateurs - "Space for All" - lots of articles
Digitized Sky Survey - The Palomar Observatory Sky Survey online.
Getting Started in Astronomy - A page from Stargazer Steve (who sells Dob kits) which is high on information and low on hard-sell.
The International Dark-Sky Association (IDA) - The organization dedicated to preserving our night skies.
Fourmilab is John Walker's site, which has some very nice FREE Wintel astronomy software, including two highly cool screen savers.
JTrack 3D - A NASA site featuring a 3-D real-time plot of almost all artificial satellites (from ACTS to XTE) currently in orbit around the earth.
The Lawnchair Zone - articles and miscellany
LEDAS: Digitized Sky Survey This resource from the Leicester Database and Archive Service allows one to view an image (from the STScI DSS) of just about any DSO. The main site also provides access to ROSAT, ASCA, Ginga and (soon) Chandra data.
Night Sky info is a personal web project from Romania full of interesting astronomical info.
NinePlanets is a very interesting source of info about the Sun's nine satellites. "The Nine Planets is an overview of the history, mythology, and current scientific knowledge of each of the planets and moons in our solar system."
Matt Ozor's Astronomy Weblog - a DVAA member's daily astro journal.
SkyMaps.com - FREE Sky Maps each month For you to explore, learn and enjoy the night sky
Seasonal Star Name Index for ETX Alignment - High Precision Star Directory Charts
SkyMaps.com - FREE Sky Maps each month For you to explore, learn and enjoy the night sky
Sky Watch provides a personalized, on-line sky calendar by sending email to its subscribers about satellite passes that can be seen from their location. It also keeps them informed about meteor showers, eclipses and other sky news. Space Weather - Science news and information about the Sun-Earth environment. This site is the place to watch for Sunspots, CMEs, and Aurora alerts.
StarDate Online - skywatching tips, astronomy news and features, astronomy images, and sky charts.
Stellafane Home Page - perhaps the most famous amateur astronomy gathering in the world.
The Telescope Review Web Site has thoughtful, hands-on reviews of telescopes, eyepieces, and accessories.
The Telescope Reviews site contains reviews of Meade, Orion and Celestron telescopes plus a number of articles about telescopes and astronomy especially aimed at beginners to the hobby.
USN Observatory Master Clock - What time is it?
Weasner's Mighty ETX Site - Dedicated to the Meade ETX telescope
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