General Astro-Photography Info & External links to other sites -  links open in separate pages.

Below, you will find various links to websites that I have used for information, buying/selling, clubs & forums, other astro-imagers' websites......whatever. You may find something of interest or value at any one of them.
My sky conditions for the next 70 hours.
Information : Tutorials : Free Software
Ascom
Astro Camp
Astronomy Know How
Astronomy Shops - Worldwide
Astro Planner
BAA Comet Section
BBC - The sky at Night
CalSKY
Cartes du Ciel
CCDCalc
Comet Chasing
DSO Browser
Heavens Above
PHD Guiding
PHD User Manual
Sky View Café
SpaceWeather.com
Stellarium
Useful Formulae - from Wilmslow Astro
Links Suggested by & for Younger Astronomers ....and maybe the not so young ☺
Useful Basic Information - A special request from AVA
Naked Eye Astronomy Guide - Ben recommends this page - Also suggested by Cindy & 'The Gang' at The California Hiking Page
Household quotes/guide-to-backyard-astronomy - James recommends this page
Online Astronomy Education - Skylar wants to pass on this link which she found helpful.
Buying or Selling Sites
AstroBoot - U.K.
AstroBuySell - Canada
AstroBuySell - U.K. 
AstroMart - U.S.A.
Clubs & Forums
Asociacion Astronomica de Cartagena (ASAC)
AstroMurcia
Atik Cameras Forum
Costa Blanca Astronomical Society
Gibraltar Astronomical Society
IFAS - Irish federation of Astronomical Societies
Irish Astronomical Association
Irish Astronomical Society
Main Sequence Software Forum
PixInsight Forum
QSI CCD Cameras - Yahoo Group
Shannonside Astronomy Club

Astro Imagers - Personal websites

Alvin Huey
APinSpain
Bernhard Hubl
Bill Snyder
Capella Observatory​
Dean Salman - Sharpless catalog
Don Goldman
Drake Visual - PixInsight Links
Harry's Astro Shed
Jim Morse Astronomy
LightVortexAstronomy
Madratter's AstroImaging
Reiner Vogel
Robert Gendler
Steve Cannistra
SWagAstro 
Trapped Photons

 

                Although I have lots more links, I only list here those with good information/tutorial pages or those whose images I might refer to myself.
                                                                                                                         
 IFAS Astro Calendar
 (With special acknowledgement & thanks to John Flannery & IFAS.)
It is possible to scroll through the above calendar.