What is the orbital period of a satellite in Medium Earth Orbit (MEO) typically used for navigation constellations like GPS?
- 90 minutes
- 12 hours
- 24 hours
- 48 hours
Answer: 12 hours
Navigation satellites in MEO (e.g., GPS at ~20,200 km altitude) have an orbital period of approximately 12 hours, ensuring global coverage with multiple overlapping orbits.