| E | O (JD) | O (dat) | Period |
| -56 | 2421826 | 1918-08-20 | 328.5 |
| -55 | 2422152 | 1919-07-12 | 327.43 |
| -53 | 2422801 | 1921-04-21 | 327.29 |
| -52 | 2423147 | 1922-04-02 | 327.85 |
| -51 | 2423467 | 1923-02-16 | 327.82 |
| -50 | 2423788 | 1924-01-03 | 327.21 |
| -49 | 2424122 | 1924-12-02 | 324.65 |
| -48 | 2424447 | 1925-10-23 | 323.57 |
| -47 | 2424776 | 1926-09-17 | 323.85 |
| -46 | 2425085 | 1927-07-23 | 322.42 |
| -45 | 2425408 | 1928-06-10 | 322 |
| -44 | 2425736 | 1929-05-04 | 323.21 |
| -43 | 2426053 | 1930-03-17 | 324.64 |
| -42 | 2426371 | 1931-01-29 | 325.42 |
| -41 | 2426706 | 1931-12-30 | 324.93 |
| -40 | 2427042 | 1932-11-30 | 324.72 |
| -39 | 2427364 | 1933-10-18 | 326.08 |
| -38 | 2427685 | 1934-09-04 | 326.22 |
| -37 | 2428008 | 1935-07-24 | 324.57 |
| -36 | 2428327 | 1936-06-07 | 325.21 |
| -35 | 2428662 | 1937-05-08 | 326.64 |
| -34 | 2428982 | 1938-03-24 | 327.28 |
| -33 | 2429310 | 1939-02-15 | 327.28 |
| -32 | 2429649 | 1940-01-20 | 326.42 |
| -31 | 2429973 | 1940-12-09 | 325.22 |
| -30 | 2430302 | 1941-11-03 | 324.51 |
| -29 | 2430615 | 1942-09-12 | 323.57 |
| -28 | 2430944 | 1943-08-07 | 322.64 |
| -27 | 2431253 | 1944-06-11 | 322.64 |
| -26 | 2431582 | 1945-05-06 | 324.35 |
| -25 | 2431907 | 1946-03-27 | 325.78 |
| -24 | 2432232 | 1947-02-15 | 326.57 |
| -23 | 2432560 | 1948-01-09 | 327.64 |
| -22 | 2432898 | 1948-12-12 | 326.93 |
| -21 | 2433222 | 1949-11-01 | 326.08 |
| -20 | 2433547 | 1950-09-22 | 325.8 |
| -19 | 2433875 | 1951-08-16 | 324.15 |
| -18 | 2434191 | 1952-06-27 | 324.64 |
| -17 | 2434513 | 1953-05-15 | 326.57 |
| -16 | 2434840 | 1954-04-07 | 325.85 |
| -15 | 2435156 | 1955-02-17 | 325.5 |
| -14 | 2435509 | 1956-02-05 | 326.92 |
| -13 | 2435832 | 1956-12-24 | 328.28 |
| -12 | 2436152 | 1957-11-09 | 328.93 |
| -11 | 2436471 | 1958-09-24 | 327.22 |
| -10 | 2436810 | 1959-08-29 | 324.65 |
| -9 | 2437139 | 1960-07-23 | 324.5 |
| -8 | 2437462 | 1961-06-11 | 325.35 |
| -7 | 2437784 | 1962-04-29 | 324.57 |
| -6 | 2438102 | 1963-03-13 | 323.28 |
| -5 | 2438425 | 1964-01-30 | 323.5 |
| -4 | 2438753 | 1964-12-23 | 323.28 |
| -3 | 2439072 | 1965-11-07 | 323.85 |
| -2 | 2439403 | 1966-10-04 | 325 |
| -1 | 2439727 | 1967-08-24 | 325.15 |
| 0 | 2440045 | 1968-07-07 | 325.51 |
| 1 | 2440375 | 1969-06-02 | 326.22 |
| 2 | 2440702 | 1970-04-25 | 326.29 |
| 3 | 2441028 | 1971-03-17 | 326.92 |
| 4 | 2441354 | 1972-02-06 | 327.71 |
| 5 | 2441688 | 1973-01-05 | 327.42 |
| 6 | 2442010 | 1973-11-23 | 327.5 |
| 7 | 2442339 | 1974-10-18 | 327.71 |
| 8 | 2442669 | 1975-09-13 | 327.07 |
| 9 | 2442992 | 1976-08-01 | 327 |
| 10 | 2443323 | 1977-06-28 | 327.01 |
| 11 | 2443647 | 1978-05-18 | 326.37 |
| 12 | 2443974 | 1979-04-10 | 326.22 |
| 13 | 2444302 | 1980-03-03 | 325.64 |
| 14 | 2444625 | 1981-01-20 | 325.21 |
| 15 | 2444952 | 1981-12-13 | 325.14 |
| 16 | 2445276 | 1982-11-02 | 324.14 |
| 17 | 2445598 | 1983-09-20 | 324.28 |
| 18 | 2445925 | 1984-08-12 | 325.42 |
| 19 | 2446248 | 1985-07-01 | 325.65 |
| 20 | 2446566 | 1986-05-15 | 325.87 |
| 21 | 2446901 | 1987-04-15 | 325.15 |
| 22 | 2447232 | 1988-03-11 | 324.43 |
| 23 | 2447555 | 1989-01-28 | 325.71 |
| 24 | 2447881 | 1989-12-20 | 326.5 |
| 25 | 2448194 | 1990-10-29 | 326 |
| 26 | 2448521 | 1991-09-21 | 325.42 |
| 27 | 2448853 | 1992-08-18 | 325.21 |
| 28 | 2449185 | 1993-07-16 | 326.64 |
| 29 | 2449512 | 1994-06-08 | 328.07 |
| 30 | 2449831 | 1995-04-23 | 328.08 |
| 31 | 2450158 | 1996-03-15 | 326.93 |
| 32 | 2450490 | 1997-02-10 | 325.28 |
| 33 | 2450818 | 1998-01-04 | 325.64 |
| 34 | 2451149 | 1998-12-01 | 326.71 |
| 35 | 2451466 | 1999-10-14 | 326.21 |
| 36 | 2451785 | 2000-08-28 | 324.64 |
| 37 | 2452117 | 2001-07-26 | 324.92 |
| 38 | 2452446 | 2002-06-20 | 326.57 |
| 39 | 2452769 | 2003-05-09 | 326.94 |
| 40 | 2453084 | 2004-03-19 | 325.65 |
| 41 | 2453432 | 2005-03-02 | 324.93 |
| 42 | 2453755 | 2006-01-19 | 326 |
| 43 | 2454073 | 2006-12-03 | 327.71 |
| 44 | 2454388 | 2007-10-14 | 327.28 |
| 45 | 2454724 | 2008-09-14 | 325.57 |
| 46 | 2455055 | 2009-08-11 | 326.78 |
| 47 | 2455386 | 2010-07-08 | 328.92 |
| 48 | 2455712 | 2011-05-30 | 328.43 |
| 49 | 2456033 | 2012-04-15 | 327.65 |
| 50 | 2456370 | 2013-03-18 | 328.3 |
| 51 | 2456696 | 2014-02-07 | 327.65 |
| 52 | 2457014 | 2014-12-22 | 327.22 |
| 53 | 2457352 | 2015-11-25 | 327 |
| 54 | 2457685 | 2016-10-23 | 325.5 |
| 55 | 2458000 | 2017-09-03 | 325.35 |
| 56 | 2458326 | 2018-07-26 | 326.28 |
| 57 | 2458655 | 2019-06-20 | 324.64 |
| 58 | 2458968 | 2020-04-28 | 323.61 |
| 59 | 2459297 | 2021-03-23 | 324.97 |
| 60 | 2459637 | 2022-02-26 | 323.76 |
| 61 | 2459945 | 2022-12-31 | 322.71 |
| 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. |