| E | O (JD) | O (dat) | Period |
| -68 | 2412744 | 1893-10-07 | 438.08 |
| -59 | 2416703 | 1904-08-10 | 439.15 |
| -58 | 2417138 | 1905-10-19 | 438.15 |
| -54 | 2418890 | 1910-08-06 | 437.25 |
| -50 | 2420640 | 1915-05-22 | 437.4 |
| -49 | 2421100 | 1916-08-24 | 436.45 |
| -45 | 2422810 | 1921-04-30 | 435.97 |
| -43 | 2423690 | 1923-09-27 | 435.39 |
| -39 | 2425440 | 1928-07-12 | 433.36 |
| -38 | 2425859 | 1929-09-04 | 432.68 |
| -37 | 2426300 | 1930-11-19 | 432.52 |
| -36 | 2426727 | 1932-01-20 | 430.17 |
| -35 | 2427147 | 1933-03-15 | 427.92 |
| -34 | 2427580 | 1934-05-22 | 428.65 |
| -33 | 2428003 | 1935-07-19 | 431.34 |
| -32 | 2428440 | 1936-09-28 | 432.61 |
| -31 | 2428850 | 1937-11-12 | 432.96 |
| -27 | 2430596 | 1942-08-24 | 434.03 |
| -23 | 2432352 | 1947-06-15 | 434.93 |
| -22 | 2432770 | 1948-08-06 | 435.27 |
| -21 | 2433214 | 1949-10-24 | 435.56 |
| -11 | 2437560 | 1961-09-17 | 435.06 |
| -10 | 2438020 | 1962-12-21 | 434.76 |
| -9 | 2438422 | 1964-01-27 | 435.35 |
| -8 | 2438882 | 1965-05-01 | 435.44 |
| -7 | 2439293 | 1966-06-16 | 435 |
| -5 | 2440176 | 1968-11-15 | 435.5 |
| -4 | 2440610 | 1970-01-23 | 434.87 |
| -3 | 2441050 | 1971-04-08 | 433.43 |
| -2 | 2441490 | 1972-06-21 | 434.65 |
| -1 | 2441920 | 1973-08-25 | 433.84 |
| 0 | 2442342 | 1974-10-21 | 432.2 |
| 1 | 2442768 | 1975-12-21 | 430.96 |
| 4 | 2444090 | 1979-08-04 | 429.96 |
| 5 | 2444505 | 1980-09-22 | 430.42 |
| 9 | 2446231 | 1985-06-14 | 431.92 |
| 10 | 2446652 | 1986-08-09 | 431.5 |
| 11 | 2447077 | 1987-10-08 | 430.15 |
| 12 | 2447515 | 1988-12-19 | 430.23 |
| 13 | 2447961 | 1990-03-10 | 430.71 |
| 14 | 2448390 | 1991-05-13 | 431.92 |
| 15 | 2448808 | 1992-07-04 | 431.64 |
| 16 | 2449242 | 1993-09-11 | 431.07 |
| 17 | 2449671 | 1994-11-14 | 432.07 |
| 18 | 2450105 | 1996-01-22 | 432.78 |
| 19 | 2450530 | 1997-03-22 | 433 |
| 20 | 2450981 | 1998-06-16 | 433.15 |
| 21 | 2451419 | 1999-08-28 | 435 |
| 22 | 2451838 | 2000-10-20 | 438.21 |
| 23 | 2452274 | 2001-12-30 | 438.42 |
| 24 | 2452703 | 2003-03-04 | 437.5 |
| 25 | 2453163 | 2004-06-06 | 438.71 |
| 26 | 2453607 | 2005-08-24 | 440.42 |
| 27 | 2454042 | 2006-11-02 | 440.71 |
| 28 | 2454483 | 2008-01-17 | 438.93 |
| 29 | 2454916 | 2009-03-25 | 438.15 |
| 30 | 2455362 | 2010-06-14 | 439.94 |
| 31 | 2455785 | 2011-08-11 | 440.29 |
| 32 | 2456226 | 2012-10-25 | 438.64 |
| 33 | 2456678 | 2014-01-20 | 437.42 |
| 34 | 2457130 | 2015-04-17 | 437.64 |
| 35 | 2457559 | 2016-06-19 | 437.14 |
| 36 | 2457981 | 2017-08-15 | 434.64 |
| 37 | 2458421 | 2018-10-29 | 432.07 |
| 38 | 2458853 | 2020-01-04 | 429.8 |
| 39 | 2459278 | 2021-03-04 | 431.93 |
| 40 | 2459711 | 2022-05-11 | 433.91 |
| 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. |