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flyingturtle wrote:Spy sats, among others.
If you have a sun-synchronous orbit, the satellite will overfly the same patch of land when the sunlight is hitting the terrain at the same angle.
From the shadows cast by objects, you can easily and consistently calculate their height.
When an underground facility is built, you can thus estimate the amount of excavated material.
bearnard123 wrote:flyingturtle wrote:Spy sats, among others.
If you have a sun-synchronous orbit, the satellite will overfly the same patch of land when the sunlight is hitting the terrain at the same angle.
From the shadows cast by objects, you can easily and consistently calculate their height.
When an underground facility is built, you can thus estimate the amount of excavated material.
I found an exaple of this rocket. It`s called rocket XL It is a three-stage light class launch vechicle. It is intended for placing pay loads into Sun-Synchronous Orbit over range of 500 km altitude. As far as I know this type of rocket deliver space weather satellites or satellites related to Earth observation.
flyingturtle wrote:bearnard123 wrote:flyingturtle wrote:Spy sats, among others.
If you have a sun-synchronous orbit, the satellite will overfly the same patch of land when the sunlight is hitting the terrain at the same angle.
From the shadows cast by objects, you can easily and consistently calculate their height.
When an underground facility is built, you can thus estimate the amount of excavated material.
I found an exaple of this rocket. It`s called rocket XL It is a three-stage light class launch vechicle. It is intended for placing pay loads into Sun-Synchronous Orbit over range of 500 km altitude. As far as I know this type of rocket deliver space weather satellites or satellites related to Earth observation.
You can launch any payload into any orbit if the rocket farts enough hot gas for a long enough time... you don't need a specific model.
MadAstronaut wrote:What if we launch a satellite to SSO? Can it be used for Earth observation?