the moon last night
photo: David Castenson
seen from China
seen from United States

seen from United States
seen from Argentina

seen from Guatemala
seen from United Kingdom

seen from Sweden
seen from Colombia
seen from T1
seen from United States
seen from United Kingdom
seen from United States
seen from China
seen from Angola

seen from T1
seen from China

seen from United States
seen from United Kingdom
seen from China

seen from United States
the moon last night
photo: David Castenson
Sails on the Potomac tall ship festival, June 13-14, 2026.
William Henry, a modern replica of a traditional Potomac River oyster fishing dory.
HMS Sultana, a replica of a 1760s British Royal Navy schooner.
Kalmar Nyckel, a replica of the 17th century Dutch-built ship that brought the first Swedish and Finnish settlers to North America.
Gazela Primeiro, a 20th century fishing barquentine that saw 68 years of service before becoming a museum ship.
Sunset on the river with the masts of Gazela Primeiro, Providence, and Sultana visible.
Photos ©️ @the-golden-vanity.
maryland 🤍
2026 Independence Day fireworks celebration over the National Mall in Washington, D.C
The Sun Set 🌇
Girl Scout in canoe, picking trash out of the Potomac River on the first Earth Day, April 22, 1970.
Now observed in 141 countries, the holiday was originally intended to bring awareness to environmental causes and oppose ecological degradation.
Thomas J. O’Halloran, photographer
Great Falls of the Potomac after heavy rains, Virginia/Maryland, 1969.
Taken at Great Falls Park in Virginia, but the state line is the southern bank of the Potomac, so both states are included in the picture. The use of so-called "natural boundaries" is irksome, for exact plotting of where the boundary falls when using rivers is extremely difficult. Midpoint, normal flow, highest possible flow, or lowest water? It can add or subtract many meters when a stream has variable flow. At least the Potomac is constrained by the geology at the Fall Line, and the channel is unlikely to shift. On rivers like the Missouri or the Mississippi where there is a large, flat floodplain, the river channel can shift by kilometers. There are lots of illustrations of bits of territory left on one side or the other after a shift. One example is provided by the boundary between Nebraska and Iowa near Omaha Airport. A slice of Iowa is now stranded on the Nebraska side thanks to an official boundary designation based on the old channel. The confusion is simpler here - where exactly is the southern bank and therefore where does Virginia jurisdiction end and that of Maryland begin? Pictured is a side channel which is frequently dry at low or even normal flow. The main stem of the river is several meters to the right of the photo. Which is used to define the boundary?
Sunset over Byron Bridge