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"My father was a master mechanic; I grew up with a screwdriver in one hand and a pair of pliers in the other."
- Frank Herbert

Twilight Belt  
  The narrow zone of livable territory on a tidally-locked planet.  

This is a unique term, but not a new idea.

It was a mining station situated on the twilight-belt of the planet, in the borderline between that face of Mercury which presented always to the sun, baked in a terrifying furnace heat of 300°C., and the other face which, presented always to starlit space, frozen in the intense cold of minus 273°C.


(Twilight Belt from 'The Mystery of the Twilight Belt' by JNT Lintott)

...He was Franz Arnheim. chief surveyor, returned but an hour ago from one of his perilous journeys along the twilight belt between a fiery desert on one side and a frost-tortured wilderness on the other.

Technovelgy from The Mystery of the Twilight Belt, by J.N.T. Lintott.
Published by Scoops in 1934
Additional resources -

Not an easy planet for walking around on...

The two men were a hundred yards from the station and disappearing behind a ridge of rock.

The sun, a huge ball of white fire hanging low on the horizon, heal pitilessly down on Hewat's left side as he started off on their track. They went along the sunny side of the twilight belt, threading their way between huge boulders that lay half buried in the white and yellow sand. Further out on the hot side of the planet were lakes and rivers of molten metal and swamps of molten lava bubbling eternally in the frightful blasts of heat.

Hewat knew that it was safer for him to keep in the darkness night ridden fringes of the twilight belt. Here were bitter cold and eternal blackness that became ever more intense away from the twilight belt, terrifying expanses of icy desolation where the last vestiges of the Mercurian air lay chained forever as solid oxygen and nitrogen.

Clifford Simak used the same phrase in Spaceship in a Flask (1941):

Old Eli was plastered when I found him in the Sun Spot, one of the many disreputable dives situated against the walls of the domed city of New Chicago on the Twilight Belt of Mercury.

See ribbon world from Foundation and Empire (1952) by Isaac Asimov for a detailed discussion.

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Additional resources:
  More Ideas and Technology from The Mystery of the Twilight Belt
  More Ideas and Technology by J.N.T. Lintott
  Tech news articles related to The Mystery of the Twilight Belt
  Tech news articles related to works by J.N.T. Lintott

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