What is a “radiosonde”? What is “sidereal time”?

A radiosonde is the thing hanging at the bottom of a weather balloon that reads telemetry and sends it to a ground station. Also, one that reads ozone is called an “ozonesonde” (and, now, there’s a chance that my first daughter will be named “Aurorasonde”).

sidereal (“sidd-ear-ee-al” time) is a measure of time based on Earth’s perspective of distant stars. This is used to fix how we make distant observations. I wonder if this is a general system that can be adapted for any planet? Otherwise, sidereal time would be totally useless on Mars.


Sidereal time

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