- Battle of Camp Allegheny (Wikipedia)
The Battle of Camp Allegheny, also known as the Battle of Allegheny Mountain, took place on December 13, 1861, in Pocahontas County, Virginia (now West Virginia), about 3 miles from the mountainous border of Highland County, Virginia, as part of the Operations in Western Virginia Campaign during the American Civil War. The battle was a small brigade-level conflict, and while the Confederates technically won with a Union withdrawal, it was considered militarily indecisive. However, it had critical implications for the future border of Virginia and West Virginia, ensuring Highland County remained in Confederate hands and would not be involved in the formation of the future state of West Virginia.
- Hertzsprung–Russell diagram (Wikipedia)
The Hertzsprung–Russell diagram (abbreviated as H–R diagram, HR diagram or HRD) is a scatter plot of stars showing the relationship between the stars’ absolute magnitudes or luminosities and their stellar classifications or effective temperatures. The diagram was created independently in 1911 by Ejnar Hertzsprung and by Henry Norris Russell in 1913, and represented a major step towards an understanding of stellar evolution.
