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the bottom is Newtonian gravity, which is an approximation.
Didn't calculations based on that take us to the moon though? Mom (sic) might have a point.
ffm-
Yes, but mom would be living in a world without GPS and certain other very precisely timed systems
Although the Global Positioning System (GPS) is not designed as a test of fundamental physics, it must account for the gravitational redshift in its timing system, and physicists have analyzed timing data from the GPS to confirm other tests. When the first satellite was launched, some engineers resisted the prediction that a noticeable gravitational time dilation would occur, so the first satellite was launched without the clock adjustment that was later built into subsequent satellites. It showed the predicted shift of 38 microseconds per day. This rate of discrepancy is sufficient to substantially impair function of GPS within hours if not accounted for. An excellent account of the role played by general relativity in the design of GPS can be found in Ashby 2003.
frankenbike
The top one is the Einstein field equation from general relativity, the bottom is Newtonian gravity, which is an approximation.
It's so idiotically niche that it made me laugh.
Fun fact, that lambda is one of the numbers that determines whether or not we get a big crunch or a heat death at the end of the universe