📅 5 July 1687
The Mathematical Principles of Natural Philosophy presented laws of motion and universal gravitation in a geometric mathematical framework.
📅 5 July 1687
Edmond Halley encouraged Newton, managed the printing and paid costs when the Royal Society could not.
📅 5 July 1687
The work argued that the same quantitative laws could explain falling bodies, planetary paths and tides.
📅 5 July 1687
Astronomical and geographic data came through imperial and maritime networks; its achievement was mathematical but not socially isolated.
📅 11 July 2005
The publication shows why ancient eclipse observations cannot be matched accurately without accounting for changes in Earth's spin.
📅 11 July 2005
Mesopotamian scholars recognized repeating relationships in lunar eclipses and passed this numerical knowledge into later traditions.
📅 11 July 2005
Comparing historical reports with Newtonian calculations revealed that the Moon's apparent motion could not be treated as perfectly uniform.
📅 11 July 2005
Long-term tidal interaction between Earth and Moon gradually changes day length and shifts reconstructed eclipse paths.
