Kaj Aage Gunnar Strand (27 February 1907 – 31 October 2000) was a Danish-born naturalized American astronomer known for his work in positional astronomy and for serving as the scientific director of the United States Naval Observatory from 1963 to 1977.

At the invitation of Ejnar Hertzsprung, during the 1930s he worked at Leiden on a program of photographing double stars; he applied these results toward his doctorate from Copenhagen in 1938.

[1] After the war Strand returned briefly to Swarthmore College, and in 1946 began as an associate professor at Yerkes Observatory.

[1][7] Strand is also known for his 1942[8] and 1957[9] claims of a planetary system around the nearby star 61 Cygni while working under the direction of Peter van de Kamp at the Sproul Observatory.

It was discovered on January 24, 1982, by E. Bowell at Lowell Observatory, Anderson Mesa Station in Flagstaff, Arizona.