Historical clue formulations

• Sagan of astronomy — 2025-05-13
• With 39-Across, scientist for whom a Cornell research institute is named — 2024-11-15
• Astronomer Sagan — 2023-01-22
• Psychologist Jung — 2022-11-25
• Fast Lewis — 2022-08-17
• Sagan who hosted TV's "Cosmos" — 2020-12-14
• ___ Laemmle, film pioneer who co-founded Universal Pictures — 2020-05-09
• Astronomer Sagan — 2020-04-20
• Baseball Hall-of-Famer Yastrzemski — 2019-09-23
• Baseball legend Yastrzemski — 2018-06-07
• Cosmologist Sagan — 2017-05-01
• Sagan who hosted "Cosmos" — 2016-12-12
• Astronomer Sagan — 2013-04-15
• Lenny's friend on "The Simpsons" — 2012-09-30
• Psychologist Jung — 2012-07-18
• Astronomer Sagan — 2011-11-02
• Hall-of-Famer Yastrzemski — 2011-09-22
• Co-worker of Homer on "The Simpsons" — 2011-02-13
• Real first name of Alfalfa of the Little Rascals — 2010-04-04
• Baseball player Yastrzemski — 2009-12-08
• Psychologist Jung — 2009-09-23
• Missing from 13-Down — 2006-09-17
• Director Reiner — 2006-04-18
• Sagan or Sandburg — 2005-10-17
• Psychologist Jung — 2005-05-31
• Rob Reiner's father — 2005-01-20
• Track star Lewis — 2003-10-27
• Songwriter Perkins — 2003-04-13
• Sagan of "Cosmos" — 2002-09-26
• Vikings great Eller — 2002-06-29
• Perkins who sang "Blue Suede Shoes" — 2000-10-02
• Cosmologist Sagan — 2000-03-23
• Director Reiner — 2000-03-12
• Poet Sandburg — 2000-01-24
• Screwballer Hubbell — 1999-11-14
• Baseball's Yastrzemski — 1999-01-12
• Perkins who wrote "Blue Suede Shoes" — 1998-08-23
• Columnist Rowan — 1998-05-16
• One of the Reiners — 1998-05-03
• Reiner of TV — 1998-04-09
• Poet Sandburg — 1997-03-03
• Sagan of "Cosmos" — 1996-12-25
• Journalist Bernstein — 1996-09-29
• 31-Across's first name — 1996-05-25
• Runner Lewis — 1996-01-22
• Columnist Rowan — 1995-10-30
• Baseball's Yastrzemski — 1994-05-11
• Runner Lewis — 1994-04-10