| E | O (JD) | O (dat) | Period |
| -55 | 2416020 | 1902-09-27 | 405 |
| -54 | 2416410 | 1903-10-22 | 404.42 |
| -53 | 2416833 | 1904-12-18 | 404.76 |
| -52 | 2417235 | 1906-01-24 | 405.21 |
| -50 | 2418042 | 1908-04-10 | 405 |
| -45 | 2420060 | 1913-10-19 | 404.46 |
| -44 | 2420475 | 1914-12-08 | 403.34 |
| -43 | 2420880 | 1916-01-17 | 403.27 |
| -42 | 2421270 | 1917-02-10 | 403.9 |
| -41 | 2421680 | 1918-03-27 | 403.08 |
| -35 | 2424085 | 1924-10-26 | 400.48 |
| -34 | 2424500 | 1925-12-15 | 399.44 |
| -32 | 2425315 | 1928-03-09 | 398.06 |
| -31 | 2425700 | 1929-03-29 | 395.65 |
| -25 | 2428070 | 1935-09-24 | 393.65 |
| -24 | 2428460 | 1936-10-18 | 392.44 |
| -23 | 2428820 | 1937-10-13 | 392.12 |
| -22 | 2429210 | 1938-11-07 | 392.11 |
| -21 | 2429610 | 1939-12-12 | 396.2 |
| -20 | 2430016 | 1941-01-21 | 402.19 |
| -19 | 2430410 | 1942-02-19 | 404.08 |
| -18 | 2430810 | 1943-03-26 | 404.18 |
| -11 | 2433644 | 1950-12-28 | 403.77 |
| 7 | 2440930 | 1970-12-09 | 403.09 |
| 8 | 2441345 | 1972-01-28 | 402.39 |
| 10 | 2442130 | 1974-03-23 | 401.75 |
| 11 | 2442530 | 1975-04-27 | 399.71 |
| 16 | 2444500 | 1980-09-17 | 395.29 |
| 17 | 2444887 | 1981-10-09 | 394.87 |
| 18 | 2445279 | 1982-11-05 | 394.91 |
| 19 | 2445683 | 1983-12-14 | 393.89 |
| 20 | 2446079 | 1985-01-13 | 392.64 |
| 21 | 2446478 | 1986-02-16 | 392.21 |
| 22 | 2446870 | 1987-03-15 | 391 |
| 23 | 2447250 | 1988-03-29 | 390.29 |
| 24 | 2447634 | 1989-04-17 | 389.71 |
| 25 | 2448023 | 1990-05-11 | 389.43 |
| 26 | 2448413 | 1991-06-05 | 391.43 |
| 27 | 2448813 | 1992-07-09 | 393.36 |
| 28 | 2449200 | 1993-07-31 | 395.5 |
| 29 | 2449600 | 1994-09-04 | 397.86 |
| 30 | 2450000 | 1995-10-09 | 399 |
| 31 | 2450391 | 1996-11-03 | 400.5 |
| 32 | 2450803 | 1997-12-20 | 403.33 |
| 33 | 2451203 | 1999-01-24 | 404.94 |
| 34 | 2451609 | 2000-03-05 | 406.44 |
| 35 | 2452011 | 2001-04-11 | 406.5 |
| 37 | 2452839 | 2003-07-18 | 405.25 |
| 38 | 2453240 | 2004-08-22 | 405.5 |
| 39 | 2453654 | 2005-10-10 | 405.19 |
| 40 | 2454044 | 2006-11-04 | 404.4 |
| 41 | 2454446 | 2007-12-11 | 404.36 |
| 42 | 2454854 | 2009-01-22 | 403.29 |
| 43 | 2455249 | 2010-02-21 | 402.79 |
| 44 | 2455667 | 2011-04-15 | 403.93 |
| 45 | 2456073 | 2012-05-25 | 404.14 |
| 46 | 2456467 | 2013-06-23 | 404.79 |
| 47 | 2456870 | 2014-07-31 | 404.07 |
| 48 | 2457275 | 2015-09-09 | 402 |
| 49 | 2457683 | 2016-10-21 | 402.29 |
| 50 | 2458087 | 2017-11-29 | 403.36 |
| 51 | 2458486 | 2019-01-02 | 403.43 |
| 52 | 2458882 | 2020-02-02 | 402.51 |
| 53 | 2459290 | 2021-03-16 | 401 |
| 54 | 2459694 | 2022-04-24 | 400.4 |
| 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. |