Series 01 Concept · Live sky instruments · Physical editions in development
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SIDEREAL CLOCKS

Astronomical timepieces for architecture & interiors

The Turning Earth

Globe: the Earth from space

Watch the Earth turn beneath the Sun from space. Change the tilt to explore the southern sky, equator or northern sky. Replay 31 March 2026 to watch every sky hand point straight up at its own midnight.

The Earth from space. The dusk line sweeps in from the left and the gold arc marks midnight: each clock strikes its own midnight as the arc crosses it, and on 31 March 2026 every Crux hand reads exactly zero at that moment. Clocks over the edge of the Earth fade until it turns them back into view.

How to read the globe

The camera faces the Sun while the Earth turns beneath it. Change the tilt to see the southern sky, equator or northern sky. Clocks on the far side fade until their meridians return to view.

The gold midnight arc

The gold arc marks midnight. Select a clock to read its local standard time, latitude and midnight-zero meridian. A gold halo appears as that clock reaches midnight.

Replay the relay

Choose Replay 31 March 2026 to follow midnight around the world. At midnight ending that date, each Crux hand reads zero on its calibrated meridian. Pause or change the playback speed to study a crossing.

A sky hand and a time hand

The hour and minute hands run clockwise. The sky hand follows its hemisphere: clockwise in the south and anticlockwise in the north. It follows sidereal time, one turn in about 23 hours, 56 minutes and 4 seconds.

The 24 midnight-zero meridians

Listed in the order midnight reaches them. Latitude never moves the hand, so each place is a real spot on its meridian. Your zone is highlighted.

ZoneMeridianLatitudePlace on the meridianNote
UTC+12178.7214° E17.70° SOff Ovalau, FijiAt sea, ~1.7 km off the west coast of Ovalau.
UTC+11163.6804° E19.70° SBelep Islands, New Caledonia
UTC+10148.6393° E33.00° SCumnock, New South WalesReference anchor: Parkes Observatory latitude, 35 km due east of the dish.
UTC+9133.5982° E34.58° NOkayama Astrophysical Observatory, JapanThe observatory dome is ~350 m west of the meridian.
UTC+8118.5572° E32.07° NNanjing (Pukou), China
UTC+7103.5161° E13.41° NSiem Reap Province, Cambodia
UTC+688.4750° E24.37° NPaba, Rajshahi, Bangladesh
UTC+573.4340° E33.90° NMurree, Pakistan
UTC+458.3929° E23.59° NMuscat (Bawshar), Oman
UTC+343.3518° E43.49° NNizhny Chegem, Kabardino-Balkaria, Russia
UTC+228.3108° E25.75° SPretoria (Mamelodi), South Africa
UTC+113.2697° E52.52° NBerlin (Charlottenburg), Germany
UTC+01.7714° W51.17° NAmesbury, Wiltshire (by Stonehenge)
UTC−116.8125° W28.30° NSantiago del Teide, TenerifeNo UTC-1 land on this meridian; the Canaries keep UTC+0.
UTC−231.8535° W72.58° NGreenland ice sheet
UTC−346.8946° W23.19° SJundiai, Sao Paulo, Brazil
UTC−461.9357° W16.24° SConcepcion, Santa Cruz, Bolivia
UTC−576.9767° W38.90° NWashington, D.C.
UTC−692.0178° W30.22° NLafayette, Louisiana
UTC−7107.0589° W38.55° NGunnison County, Colorado
UTC−8122.0999° W37.39° NMountain View, California
UTC−9137.1410° W58.66° NMount Crillon, Fairweather Range, Alaska
UTC−10152.1821° W16.44° SOff Maupiti, French PolynesiaAt sea, ~5 km east of Maupiti reef.
UTC−11167.2231° W53.60° NUnalaska Island, AlaskaNo UTC-11 land on this meridian; Alaska keeps UTC-9.
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