| E | O (JD) | O (dat) | Period |
| -20 | 2422932 | 1921-08-30 | 250.43 |
| -13 | 2424675 | 1926-06-08 | 249.21 |
| -11 | 2425170 | 1927-10-16 | 247.12 |
| -10 | 2425430 | 1928-07-02 | 247.86 |
| -6 | 2426430 | 1931-03-29 | 248.31 |
| -4 | 2426910 | 1932-07-21 | 248.28 |
| -1 | 2427640 | 1934-07-21 | 248 |
| 0 | 2427903 | 1935-04-10 | 247 |
| 2 | 2428395 | 1936-08-14 | 247.41 |
| 3 | 2428650 | 1937-04-26 | 249.04 |
| 6 | 2429390 | 1939-05-06 | 248.64 |
| 8 | 2429880 | 1940-09-07 | 247.71 |
| 9 | 2430140 | 1941-05-25 | 247.47 |
| 12 | 2430885 | 1943-06-09 | 248.83 |
| 15 | 2431620 | 1945-06-13 | 249.56 |
| 21 | 2433100 | 1949-07-02 | 249.45 |
| 24 | 2433844 | 1951-07-16 | 249.38 |
| 50 | 2440370 | 1969-05-28 | 249.65 |
| 52 | 2440861 | 1970-10-01 | 249.87 |
| 53 | 2441111 | 1971-06-08 | 249.9 |
| 55 | 2441610 | 1972-10-19 | 249.31 |
| 56 | 2441866 | 1973-07-02 | 247.45 |
| 58 | 2442344 | 1974-10-23 | 247.73 |
| 59 | 2442593 | 1975-06-29 | 247.52 |
| 60 | 2442840 | 1976-03-02 | 247.15 |
| 62 | 2443340 | 1977-07-15 | 247.38 |
| 65 | 2444082 | 1979-07-27 | 248.08 |
| 68 | 2444827 | 1981-08-10 | 248.26 |
| 69 | 2445075 | 1982-04-15 | 248 |
| 71 | 2445567 | 1983-08-20 | 248.16 |
| 72 | 2445820 | 1984-04-29 | 248.55 |
| 74 | 2446316 | 1985-09-07 | 248.24 |
| 75 | 2446560 | 1986-05-09 | 248.29 |
| 77 | 2447066 | 1987-09-27 | 248.33 |
| 78 | 2447311 | 1988-05-29 | 248.33 |
| 80 | 2447804 | 1989-10-04 | 248.45 |
| 81 | 2448052 | 1990-06-09 | 248.13 |
| 83 | 2448550 | 1991-10-20 | 247.87 |
| 84 | 2448801 | 1992-06-27 | 248.52 |
| 87 | 2449541 | 1994-07-07 | 249.05 |
| 89 | 2450040 | 1995-11-18 | 248.81 |
| 90 | 2450286 | 1996-07-21 | 248.35 |
| 91 | 2450545 | 1997-04-06 | 249.28 |
| 92 | 2450790 | 1997-12-07 | 250.07 |
| 93 | 2451037 | 1998-08-11 | 249.5 |
| 94 | 2451281 | 1999-04-12 | 249.21 |
| 95 | 2451548 | 2000-01-04 | 249.21 |
| 96 | 2451784 | 2000-08-27 | 249.57 |
| 97 | 2452035 | 2001-05-05 | 250.13 |
| 98 | 2452285 | 2002-01-10 | 250 |
| 99 | 2452539 | 2002-09-21 | 249.88 |
| 100 | 2452782 | 2003-05-22 | 250.67 |
| 102 | 2453288 | 2004-10-09 | 250.44 |
| 103 | 2453541 | 2005-06-19 | 249.94 |
| 105 | 2454039 | 2006-10-30 | 250.44 |
| 106 | 2454292 | 2007-07-10 | 250.32 |
| 107 | 2454536 | 2008-03-10 | 248.81 |
| 108 | 2454787 | 2008-11-16 | 248.38 |
| 109 | 2455042 | 2009-07-29 | 248.85 |
| 112 | 2455784 | 2011-08-10 | 249.38 |
| 114 | 2456270 | 2012-12-08 | 249.36 |
| 115 | 2456526 | 2013-08-21 | 248.95 |
| 116 | 2456782 | 2014-05-04 | 249.05 |
| 118 | 2457283 | 2015-09-17 | 249.82 |
| 119 | 2457526 | 2016-05-17 | 249.56 |
| 120 | 2457780 | 2017-01-26 | 248.44 |
| 121 | 2458027 | 2017-09-30 | 247.67 |
| 122 | 2458274 | 2018-06-04 | 247.36 |
| 123 | 2458515 | 2019-01-31 | 247.71 |
| 124 | 2458768 | 2019-10-11 | 247.64 |
| 125 | 2459012 | 2020-06-11 | 247.35 |
| 126 | 2459260 | 2021-02-14 | 248.09 |
| 127 | 2459514 | 2021-10-26 | 248.33 |
| 128 | 2459760 | 2022-06-29 | 247.4 |
| E | Cycle number from the GCVS4 epoch. |
| O (JD) | Julian date at observed time for maximum. |
| O (Dat) | Same as above, expressed as date. |
| Period | Calculated mean period at cycle number E. |