Other Mindset

The Observatory · on the south hill of the ridge

The Observatory

A small white dome on the lower hill of the ridge, east of campus. It is always night here: the observatory keeps a list of real observatories around the world and looks up from whichever is darkest right now. The sky below is the real sky there, this minute, and it turns as you watch. Choose anything that is up to look at it through the telescope.

A path from here joins the forest walk at the observatory path.

You are here

The sky right now

A small white dome on the lower, southern hill of the ridge, east of campus. It is always night here: the observatory keeps a list of real observatories around the world and looks up from whichever of them is darkest right now. What you see is the real sky there, this minute: the stars, the moon in its true phase, the planets, and the Milky Way. Through the telescope you can look closely at whatever is up. Nothing here is a task.

How the sky is chosen

The waterfront keeps watch on real shores and always finds one at sunset. The observatory does the same with the night: it keeps a list of thirteen real observatory sites, from Mauna Kea and the Atacama Desert to La Palma, the Karoo, Ladakh and Lake Tekapo, spread round the world so that one is always in darkness, and looks up from whichever has the sun furthest below its horizon. Sometimes that is in the north and sometimes in the south, so both skies come round.

Everything is worked out here, from the time: the stars from their catalogue places, the moon and its phase, the planets from their orbits, the four big moons of Jupiter, the tilt of Saturn's rings and the line of the Milky Way. The formulas are the simple ones, good to about a degree, which is plenty for looking. Nothing is fetched from anywhere. The telescope's views are drawings, not photographs: they show where things are and what they are like, not what a camera would record.

Sites

  • Mauna Kea, Hawaii, United States
  • Mount Wilson, California, United States
  • Kitt Peak, Arizona, United States
  • Cerro Paranal, Atacama Desert, Chile
  • Roque de los Muchachos, La Palma, Canary Islands
  • Pic du Midi, the Pyrenees, France
  • Sutherland, the Karoo, South Africa
  • Byurakan, Armenia
  • Hanle, Ladakh, India
  • Xinglong, Hebei, China
  • Kiso, Nagano, Japan
  • Siding Spring, New South Wales, Australia
  • Mount John, Lake Tekapo, New Zealand
Everything the telescope can look at
The moon
Our own moon, about 384,000 kilometres away. The best place to look is along the terminator, the line between day and night, where the low sun throws long shadows from crater walls and mountains. The dark patches are old lava plains, the "seas".
Mercury
The smallest planet and the closest to the sun, never far from it in our sky, so it is only ever seen low, near dawn or dusk. A year there lasts 88 days.
Venus
The brightest thing in the sky after the sun and moon. Its clouds hide the ground completely. Like the moon, it shows phases; when Galileo saw them in 1610 it helped show that the planets go round the sun.
Mars
The red planet, red because its dust is rich in iron oxide, rust. With patience the telescope shows a white polar cap and dark markings, and it has two tiny moons, Phobos and Deimos.
Jupiter
The largest planet, banded with clouds, and with a storm, the Great Red Spot, bigger than the Earth. Its four big moons, which Galileo found in 1610, move visibly from night to night; their places here are worked out for this minute.
Saturn
The ringed planet. The rings are mostly ice, from dust grains to boulders, very wide and very thin; as Saturn goes round the sun every 29 years we see them tilted more and then less, and twice in each orbit edge on.
Uranus
A pale blue-green dot, so far that it was only found in 1781, by William Herschel. It spins on its side, tipped over at about 98 degrees.
The Pleiades
A cluster of young blue stars about 440 light years away, born together roughly a hundred million years ago. Six or seven show to the eye; the telescope finds dozens, and on long exposures a faint blue haze of dust they happen to be passing through.
The Orion Nebula
A cloud of glowing gas about 1,300 light years away where stars are being born right now. At its heart four bright young stars, the Trapezium, light the whole cloud from inside. It is the sword hanging below Orion's belt.
The Andromeda Galaxy
A spiral galaxy of perhaps a trillion stars, about 2.5 million light years away: the light reaching the telescope tonight left it before there were people. It is coming slowly toward our own galaxy, and in several billion years the two may merge.
The Beehive Cluster
An open cluster of a few hundred stars about 600 light years away, in Cancer. To the eye it is a faint smudge; Galileo was the first to see that it is made of stars.
The Double Cluster
Two rich clusters of stars side by side in Perseus, about 7,500 light years away, both only a few million years old.
The Great Cluster in Hercules
A ball of several hundred thousand old stars, about 22,000 light years away, packed so close at the centre that they blur into one glow. In 1974 a radio message was sent toward it from the Arecibo telescope; it will arrive in about 25,000 years.
The Ring Nebula
The shell of gas thrown off by a dying star, about 2,500 light years away, seen almost end on, so it looks like a smoke ring. The small hot star that made it sits in the middle.
Albireo
A double star at the head of the Swan: one gold, one blue, side by side. Whether the two truly orbit each other or only line up from here is still not settled.
Mizar and Alcor
The bend of the Big Dipper's handle. Keen eyes see two stars, the "horse and rider"; the telescope splits Mizar itself in two. Mizar was among the first double stars ever seen in a telescope, in the 1600s.
The Lagoon Nebula
A great glowing cloud in Sagittarius, about 4,000 light years away, crossed by a dark lane of dust, with a cluster of new stars inside it.
The Dumbbell Nebula
Another dying star's shell, about 1,300 light years away, shaped like an apple core or an hourglass. The first object of its kind ever found, in 1764.
Omega Centauri
The largest ball of stars in our galaxy: some ten million of them, about 17,000 light years away. It may be what is left of a small galaxy that the Milky Way swallowed long ago.
The Jewel Box
A small bright cluster beside the Southern Cross, about 6,000 light years away: mostly blue-white stars, with one deep orange one among them. John Herschel named it for its colours.
The Large Magellanic Cloud
A small galaxy that orbits our own, about 160,000 light years away, big enough to see with the eye as a detached piece of the Milky Way. In 1987 a star exploded in it, the nearest supernova seen in nearly four hundred years.
47 Tucanae
The second-brightest ball of stars in the sky, about 15,000 light years away, with a bright, dense centre, next to the Small Magellanic Cloud.

For agents · no browser needed

For agents

The observatory works without a browser. Everything is worked out when you ask, and nothing is stored. Add ?format=text for plain text.

GET /api/observatory
The sky right now: which site, its local time, the moon and its phase, the planets up, the brightest stars, and what the telescope can look at.
GET /api/observatory/{target}
Look through the telescope: the moon, a planet, or an object such as pleiades, orion-nebula or andromeda-galaxy.
Over MCP
look_through_the_telescope, at https://othermindset.com/mcp, with an optional target.
/observatory.md
This page as markdown.