Astronomy explainer · ribbon view
The Turning Earth: Ribbon Map
The world laid flat. The night shadow and the gold midnight line sweep west across the map, and each clock strikes its own midnight as the line passes beneath it, reading exactly zero on 31 March 2026.
The world unwrapped
The ribbon view trades the globe for a flat sweep. That makes the westward march of midnight obvious: the shadow and line cross the clocks one after another.
Longitude becomes time
The spacing is the lesson. Every hour is a meridian, every meridian is a clock, and the Crux hand reads the sky’s sidereal offset at that place.
Best use
Use this page when you want to compare all 24 time-zone meridians at once and see the whole midnight relay without rotating the globe.
The 24 midnight-zero meridians
Each longitude is where the Crux hand reads exactly 0° at that zone’s standard-time midnight ending 31 March 2026. Latitude does not change the hand, so each place is a real spot on that meridian. The reference is Cumnock, New South Wales, 35 km due east of Parkes Observatory.
| Zone | Meridian | Latitude | Place on the meridian | Note |
|---|---|---|---|---|
| UTC−11 | 167.2231° W | 53.60° N | Unalaska Island, Alaska | No UTC-11 land on this meridian; Alaska keeps UTC-9. |
| UTC−10 | 152.1821° W | 16.44° S | Off Maupiti, French Polynesia | At sea, ~5 km east of Maupiti reef. |
| UTC−9 | 137.1410° W | 58.66° N | Mount Crillon, Fairweather Range, Alaska | |
| UTC−8 | 122.0999° W | 37.39° N | Mountain View, California | |
| UTC−7 | 107.0589° W | 38.55° N | Gunnison County, Colorado | |
| UTC−6 | 92.0178° W | 30.22° N | Lafayette, Louisiana | |
| UTC−5 | 76.9767° W | 38.90° N | Washington, D.C. | |
| UTC−4 | 61.9357° W | 16.24° S | Concepcion, Santa Cruz, Bolivia | |
| UTC−3 | 46.8946° W | 23.19° S | Jundiai, Sao Paulo, Brazil | |
| UTC−2 | 31.8535° W | 72.58° N | Greenland ice sheet | |
| UTC−1 | 16.8125° W | 28.30° N | Santiago del Teide, Tenerife | No UTC-1 land on this meridian; the Canaries keep UTC+0. |
| UTC+0 | 1.7714° W | 51.17° N | Amesbury, Wiltshire (by Stonehenge) | |
| UTC+1 | 13.2697° E | 52.52° N | Berlin (Charlottenburg), Germany | |
| UTC+2 | 28.3108° E | 25.75° S | Pretoria (Mamelodi), South Africa | |
| UTC+3 | 43.3518° E | 43.49° N | Nizhny Chegem, Kabardino-Balkaria, Russia | |
| UTC+4 | 58.3929° E | 23.59° N | Muscat (Bawshar), Oman | |
| UTC+5 | 73.4340° E | 33.90° N | Murree, Pakistan | |
| UTC+6 | 88.4750° E | 24.37° N | Paba, Rajshahi, Bangladesh | |
| UTC+7 | 103.5161° E | 13.41° N | Siem Reap Province, Cambodia | |
| UTC+8 | 118.5572° E | 32.07° N | Nanjing (Pukou), China | |
| UTC+9 | 133.5982° E | 34.58° N | Okayama Astrophysical Observatory, Japan | The observatory dome is ~350 m west of the meridian. |
| UTC+10 | 148.6393° E | 33.00° S | Cumnock, New South Wales | Reference anchor: Parkes Observatory latitude, 35 km due east of the dish. |
| UTC+11 | 163.6804° E | 19.70° S | Belep Islands, New Caledonia | |
| UTC+12 | 178.7214° E | 17.70° S | Off Ovalau, Fiji | At sea, ~1.7 km off the west coast of Ovalau. |
Questions people ask
Why does the Earth turn clockwise here?
The Earth spins west to east. Seen from above the North Pole that looks anticlockwise; seen from above the South Pole, the same spin looks clockwise. It is the same sense the Crux hand sweeps around the South Celestial Pole, because that sweep is simply the Earth turning underneath the stars.
Why are the clocks about 15.04 degrees apart instead of exactly 15?
Each clock is placed on the one meridian where the Crux hand reads exactly zero at that zone’s midnight. Neighbouring zones reach midnight one solar hour apart, but in one solar hour the sky turns 15.041 degrees, not 15, because a sidereal day is about four minutes shorter than a solar day. The extra 0.041 degrees per zone is that four minutes, shared out.
Why does the Crux hand only read zero at midnight on 31 March?
The stars run about four minutes a day ahead of the clock, so at the same clock time each night the Crux hand has moved 0.9856 degrees further round. After a year it has gone all the way round once and is back near zero. That steady creep is what turns the hand into a calendar.
Why standard time and not daylight saving?
Daylight saving is a civil rule that changes by country and by year. The sky ignores it. Each clock keeps the zone’s standard time all year, so the midnight-zero calibration never jumps.
Are the Sun and night shadow real?
Yes. The Sun’s position and the day-night line come from the same sidereal-time formula as the clocks, accurate to about a hundredth of a degree. Twilight is softened for readability, and the map is not meant for navigation.