| E | O (JD) | O (dat) | Period |
| -64 | 2416670 | 1904-07-08 | 422.11 |
| -63 | 2417120 | 1905-10-01 | 426.67 |
| -62 | 2417520 | 1906-11-05 | 432.91 |
| -58 | 2419230 | 1911-07-12 | 433.51 |
| -57 | 2419640 | 1912-08-25 | 431.95 |
| -53 | 2421390 | 1917-06-10 | 432.24 |
| -48 | 2423600 | 1923-06-29 | 432.32 |
| -47 | 2424020 | 1924-08-22 | 431.82 |
| -43 | 2425752 | 1929-05-20 | 430.46 |
| -41 | 2426610 | 1931-09-25 | 425.8 |
| -36 | 2428730 | 1937-07-15 | 427.59 |
| -35 | 2429140 | 1938-08-29 | 429.85 |
| -34 | 2429539 | 1939-10-02 | 429.95 |
| -27 | 2432483 | 1947-10-24 | 430.83 |
| -7 | 2441220 | 1971-09-25 | 431.68 |
| -5 | 2442080 | 1974-02-01 | 432.42 |
| -4 | 2442528 | 1975-04-25 | 433.64 |
| -3 | 2442970 | 1976-07-10 | 432.87 |
| -2 | 2443391 | 1977-09-04 | 427.63 |
| -1 | 2443828 | 1978-11-15 | 425.38 |
| 2 | 2445080 | 1982-04-20 | 422.89 |
| 3 | 2445505 | 1983-06-19 | 421.78 |
| 4 | 2445920 | 1984-08-07 | 421 |
| 5 | 2446345 | 1985-10-06 | 421.19 |
| 6 | 2446765 | 1986-11-30 | 421.28 |
| 7 | 2447188 | 1988-01-27 | 420.79 |
| 8 | 2447609 | 1989-03-23 | 421.86 |
| 9 | 2448038 | 1990-05-26 | 422.07 |
| 10 | 2448445 | 1991-07-07 | 421.64 |
| 11 | 2448871 | 1992-09-05 | 422.64 |
| 12 | 2449300 | 1993-11-08 | 424.65 |
| 13 | 2449719 | 1995-01-01 | 427.15 |
| 14 | 2450137 | 1996-02-23 | 429.85 |
| 15 | 2450577 | 1997-05-08 | 431.5 |
| 16 | 2451015 | 1998-07-20 | 432.93 |
| 17 | 2451448 | 1999-09-26 | 435.43 |
| 18 | 2451886 | 2000-12-07 | 435.65 |
| 19 | 2452326 | 2002-02-20 | 434.57 |
| 20 | 2452754 | 2003-04-24 | 434.71 |
| 21 | 2453198 | 2004-07-11 | 434.21 |
| 22 | 2453615 | 2005-09-01 | 433.93 |
| 23 | 2454061 | 2006-11-21 | 434.58 |
| 24 | 2454488 | 2008-01-22 | 434.5 |
| 25 | 2454925 | 2009-04-03 | 433.64 |
| 26 | 2455362 | 2010-06-14 | 434.21 |
| 27 | 2455802 | 2011-08-28 | 434.15 |
| 28 | 2456233 | 2012-11-01 | 433.72 |
| 29 | 2456651 | 2013-12-24 | 432.85 |
| 30 | 2457104 | 2015-03-22 | 430.85 |
| 31 | 2457523 | 2016-05-14 | 429.5 |
| 32 | 2457962 | 2017-07-27 | 429.5 |
| 33 | 2458385 | 2018-09-23 | 428.71 |
| 34 | 2458811 | 2019-11-23 | 427.85 |
| 35 | 2459237 | 2021-01-22 | 426.91 |
| 36 | 2459660 | 2022-03-21 | 424.51 |
| 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. |