1. The elevator’s anchor

Arthur C. Clarke’s The Fountains of Paradise puts the space elevator’s counterweight far beyond geostationary orbit, but the anchor point is GEO itself — the one altitude where a satellite can hover over a single spot on the equator. The book treats GEO as a place of stillness relative to the ground, and therefore as a place where infrastructure can behave like ground infrastructure.

This entry wonders whether the desktop should be in GEO or MEO.

2. The geostationary promise

GEO is the only Earth orbit that does not move relative to a ground antenna. For a desktop whose customers want continuous connectivity, that is a powerful feature. A GEO desktop could be reached by the same ground stations, day and night, with no handoffs and no variable slant range.

The potential advantages:

  • Persistent coverage: one ground station can talk to it continuously.
  • No atmospheric drag: orbital lifetime is limited by station-keeping propellant, not decay.
  • Stable thermal environment: one eclipse season per year, predictable Sun angles.
  • Lower relative velocity to other GEO assets: servicing or co-location with communications satellites is easier than in LEO.

The potential disadvantages:

  • Launch cost: reaching GEO requires a much larger rocket or a long electric-propulsion spiral from GTO.
  • Radiation: GEO sits in the outer Van Allen belt; total dose is higher than LEO, though the spectrum is different.
  • Latency: round-trip light time is ~240 ms, which affects closed-loop control and interactive workloads.
  • Debris and slot management: GEO is a regulated commons; co-location requires coordination and longitude licensing.
  • Thermal design: the Sun-Earth geometry in GEO produces long, hot eclipses during equinox.

3. MEO as the compromise

Medium Earth orbit — roughly 2,000 to 35,000 km — sits between LEO and GEO. Navigation constellations live there. It offers longer dwell than LEO and lower latency than GEO, but it has neither the cheap launch of LEO nor the stationary footprint of GEO. It also passes through parts of the radiation belts.

For the desktop, MEO does not solve a pressing problem. The customers who want persistence would prefer GEO; the customers who want cheap access and low latency would prefer LEO. MEO is a middle child.

4. Why it is probably wrong for the first generation

GEO and MEO are attractive once the desktop has a clear customer who values continuous coverage or co-location with existing GEO assets. The first generation does not have that customer yet. It has a compute platform trying to prove that attachments can be swapped and that the thermal and power budgets close in orbit. LEO is the cheapest, fastest, safest place to prove that.

5. What it teaches

Orbit altitude is a market-selection filter. LEO rewards agility and frequent access. GEO rewards persistence and stable geometry. MEO rewards neither particularly well unless the mission is navigation or timing. The desktop’s first market is not defined by persistence, so GEO is not the right starting point.

6. What this changes

  • GEO is recorded as a future variant for a persistence-focused customer.
  • MEO is recorded as a low-priority option unless a specific navigation or timing mission appears.
  • The next entry will compare the orbits directly and decide what the default means.