The reason why there are not exactly 8700 hours in a solar year is that we use leap years to account for the fact that Earth orbits around the sun at approximately 365.24 days per year (a tropical year). This means that our calendar year, which is based on the Gregorian system and has 365 days, does not perfectly match up with a solar year.

To make things more complicated, there are also other factors to consider when calculating time in space, such as relativistic effects due to gravity and the curvature of spacetime around massive objects like planets or stars. These can cause small variations in how much time passes for different observers at different locations relative to a gravitational field.

So while it is true that there are approximately 8700 hours in a solar year, this number may not be exact due to the complexities of calculating time and space.
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