Struve carefully measured the " constant of aberration " in 1843.
2.
There he repaired the meridian circle and used it to do a determination of the constant of aberration.
3.
He independently co-discovered the nova T Coronae Borealis, improved the estimate of the constant of aberration, and computed the orbital parameters of asteroids and comets.
4.
Along with improved measurements of the speed of light, these showed that Newcomb's values for the solar parallax and the constant of aberration were inconsistent with one another.
5.
Based on his early calculations, Bradley was able to estimate the constant of aberration at 20 ", and with this was able to estimate the speed of light at per second.
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