Thomas Jefferson, principal author of the Declaration of Independence, and john adams both died on the 4th of July, 1826.
Benjamin Franklin, Thomas Jefferson, and john adams proposed that he be on the seal of the United States in 1776.
Curiosity about these leaders—George Washington, john adams, and Thomas Jefferson, to name only the most famous—seems insatiable.
American astronomer who demonstrated that the essential brightness of a star could be calculated by studying its spectrum and who introduced a method for measuring the distance of stars based on their brightness. In 1915 he discovered Sirius B, the first known white dwarf star, and his measurement of the gravitational red shift in the light leaving its surface was accepted as evidence for Albert Einstein's general theory of relativity.