How interesting that you would use "gravity" as an example.
Scientists had to wait until 1919 to test one of the aspects of Einstein's General Relativity. The observed position of a star near the eclipsed sun indicated that the light passing near the sun was deflected by gravity. Have you tested this aspect yourself?
It's also interesting that you continue to ask why there is no evidence for "macro evolution". It was not that long ago when doubters would ask for evidence of "evolution". What changed? It would appear that "micro evolution" is no longer in question. Since that development took approximately 150 years, why is it reasonable to expect "macro evolution" to be proven any sooner than another 150 years?
I find it particularly interesting that the complete mapping of many organisms' genomes will permit analysis of aspects of genetic evolution which were not previously possible. There may well be evidence of "macro evolution" discovered in the tangled mass of DNA now under examination. There may be enough information to "roll back the clock" by cloning organisms whose genomes are recoverable from present genomes.
Apparently they saw a change in direction of the light. They attributed it to the gravity of the sun.
Could it not be from passing through the atmosphere of the sun caused a refraction which is known to change the direction of light?