spacecraft destination          launched  closest approach                   time elapsed
0   venera 1       venus  12 february 1961       19 may 1961    97 days (3 months , 8 days)
1  mariner 2       venus    27 august 1962  14 december 1962  110 days (3 months , 18 days)
2     mars 1        mars   1 november 1962      19 june 1963  231 days (7 months , 19 days)
3     zond 1       venus      2 april 1964      14 july 1964  104 days (3 months , 13 days)
4  mariner 4        mars  28 november 1964      15 july 1965  230 days (7 months , 18 days)
5     zond 2        mars  30 november 1964     6 august 1965   250 days (8 months , 8 days)
6   venera 2       venus  12 november 1965  27 february 1966  108 days (3 months , 16 days)
7  mariner 5       venus      14 june 1967   19 october 1967   128 days (4 months , 6 days)
8  mariner 6        mars  24 february 1969      31 july 1969   158 days (5 months , 8 days)
9  mariner 7        mars  27 february 1969     5 august 1969  160 days (5 months , 10 days)

Table as JSON:
{"spacecraft":{"0":"venera 1","1":"mariner 2","2":"mars 1","3":"zond 1","4":"mariner 4","5":"zond 2","6":"venera 2","7":"mariner 5","8":"mariner 6","9":"mariner 7"},"destination":{"0":"venus","1":"venus","2":"mars","3":"venus","4":"mars","5":"mars","6":"venus","7":"venus","8":"mars","9":"mars"},"launched":{"0":"12 february 1961","1":"27 august 1962","2":"1 november 1962","3":"2 april 1964","4":"28 november 1964","5":"30 november 1964","6":"12 november 1965","7":"14 june 1967","8":"24 february 1969","9":"27 february 1969"},"closest approach":{"0":"19 may 1961","1":"14 december 1962","2":"19 june 1963","3":"14 july 1964","4":"15 july 1965","5":"6 august 1965","6":"27 february 1966","7":"19 october 1967","8":"31 july 1969","9":"5 august 1969"},"time elapsed":{"0":"97 days (3 months , 8 days)","1":"110 days (3 months , 18 days)","2":"231 days (7 months , 19 days)","3":"104 days (3 months , 13 days)","4":"230 days (7 months , 18 days)","5":"250 days (8 months , 8 days)","6":"108 days (3 months , 16 days)","7":"128 days (4 months , 6 days)","8":"158 days (5 months , 8 days)","9":"160 days (5 months , 10 days)"}}