Clear Sky Chart

Weather Underground

National Weather Service

Most recent fog map

Fog animation, last several hours

The Sun

The Sun now (Solar Dynamics Observatory)

SDO gallery

The Sun's interior

The photosphere

The chromosphere

The corona

August 21, 2017 eclipse

Solar eclipses around the world in next 10 years

The nearest stars and how they compare to our Sun

The Moon

Phases this month

Rise and set times this month

maria and craters on the full moon

Apollo landing sites

waxing crescent with labels

first quarter with labels

waxing gibbous with labels

phase animation with music

moon phases explained

Next lunar eclipse visible from San Francisco

Eclipses explained

The Planets

Sky&Tel This Week's Sky at a Glance

Planet rise/set times tonight

Planet distances from Earth tonight

Jupiter's moons tonight

Saturn's moons tonight

Binary and Multiple Stars

Sky&Tel's pretty double stars for everyone

Coldfield Observatory's 200 most beautiful double stars

The Astronomical League's Double Star Club

Astronomy Magazine: double (and variable) stars by season

more double and multiple stars from Sky&Tel

multiple-star catalogs and statistics by Bruce MacEvoy

Variable Stars and Supernovae

Eclipse timing tool for Algol and more

Algol explained

Top 12 Naked-Eye Variables

American Association of Variable Star Observers

Cataclysmic Variables from the Center for Backyard Astrophysics

Recent supernovae, sorted by date

Supernovae, sorted by magnitude at discovery

Galaxies, Nebulae and Star Clusters

Messier catalog

111 Deep Sky Wonders for Light-Polluted Skies

Hidden Gems in Common Deep-Sky Objects