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Èrni Vrh Observatory observatorij.org
McDonald Observatory | Visitor information, teacher workshops, public programs in Fort Davis, Texas mcdonaldobservatory.org
OPT Telescopes | Buy New & Used Telescopes & Accessories optcorp.com
From Amateurs To Experts, Astrophotographers choose OPT Telescopes for all of their needs. Shop OPT for the best telescopes & customer service!
Physics Inside-Out: A Paradigm of Peace, by Loren Booda quantumdream.net
Physics inverts phase space through Planck's constant and spacetime through the Planck length.
W. M. Keck Observatory – The Keck Observatory telescopes on Maunakea in Hawaii, are the world's largest optical and infrared telescopes. Keck Observatory's vision is to advance the frontiers of astronomy and share our discoveries with the world. keckobservatory.org
The Keck Observatory telescopes on Maunakea in Hawaii, are the world's largest optical and infrared telescopes. Keck Observatory's vision is to advance the frontiers of astronomy and share our discoveries with the world.
British Astronomical Association – Supporting amateur astronomers since 1890 britastro.org
eBird - Discover a new world of birding... ebird.org
eBird transforms your bird sightings into science and conservation. Plan trips, find birds, track your lists, explore range maps and bird migration-all free.
The Naked Eye Planets in the Night Sky (and how to identify them) nakedeyeplanets.com
Describes the appearance and movements of the planets in the dawn, dusk and night sky and what can be seen in binoculars & small telescopes. With planet position charts, photographs, origins of the planets' names, discovery histories and planetary visibility tables