Conjunctions in angular separation of Neptune and Mars June 13, 2020 - 11:52 Neptune 1.63° from Mars May 18, 2022 - 06:24 Neptune 0.52° from Mars April 29, 2024 - 04:31 Neptune 0.03° from Mars April 13, 2026 - 05:25 Neptune 0.32° from Mars March 28, 2028 - 00:27 Neptune 0.63° from Mars March 12, 2030 - 21:47 Mars 0.94° from Neptune. February 25, 2032 - 05:10 Mars 1.29° from Neptune. February 6, 2034 - 13:23 Mars 1.69° from Neptune. January 12, 2036 - 07:38 Mars 2.23° from Neptune. July 16, 2037 - 11:48 Mars 0.61° from Neptune. June 23, 2039 - 04:52 Mars 0.4° from Neptune.