| E | O (JD) | O (dat) | Period |
| -88 | 2412620 | 1893-06-05 | 326.9 |
| -87 | 2412940 | 1894-04-21 | 328.39 |
| -84 | 2413940 | 1897-01-15 | 330.27 |
| -78 | 2415900 | 1902-05-30 | 331.51 |
| -77 | 2416220 | 1903-04-15 | 332 |
| -76 | 2416570 | 1904-03-30 | 332.5 |
| -75 | 2416900 | 1905-02-23 | 333.48 |
| -67 | 2419590 | 1912-07-06 | 334.77 |
| -63 | 2420910 | 1916-02-16 | 335 |
| -60 | 2421930 | 1918-12-02 | 335.53 |
| -56 | 2423250 | 1922-07-14 | 334.68 |
| -55 | 2423600 | 1923-06-29 | 332.93 |
| -54 | 2423930 | 1924-05-24 | 333.06 |
| -50 | 2425310 | 1928-03-04 | 333.23 |
| -45 | 2426910 | 1932-07-21 | 333.57 |
| -44 | 2427240 | 1933-06-16 | 334.29 |
| -43 | 2427590 | 1934-06-01 | 332 |
| -42 | 2427920 | 1935-04-27 | 331.18 |
| -41 | 2428270 | 1936-04-11 | 334.13 |
| -40 | 2428620 | 1937-03-27 | 333.79 |
| -34 | 2430580 | 1942-08-08 | 332.96 |
| -33 | 2430913 | 1943-07-07 | 332.59 |
| -32 | 2431256 | 1944-06-14 | 332.22 |
| -31 | 2431585 | 1945-05-09 | 332.45 |
| -30 | 2431916 | 1946-04-05 | 332.82 |
| -7 | 2439573 | 1967-03-23 | 332.47 |
| -1 | 2441569 | 1972-09-08 | 332.51 |
| 0 | 2441900 | 1973-08-05 | 332.68 |
| 1 | 2442225 | 1974-06-26 | 332.26 |
| 2 | 2442552 | 1975-05-19 | 331.14 |
| 3 | 2442900 | 1976-05-01 | 330.4 |
| 4 | 2443223 | 1977-03-20 | 330.4 |
| 5 | 2443550 | 1978-02-10 | 331.3 |
| 9 | 2444877 | 1981-09-29 | 330.5 |
| 10 | 2445200 | 1982-08-18 | 329.7 |
| 11 | 2445533 | 1983-07-17 | 330.45 |
| 12 | 2445870 | 1984-06-18 | 330.59 |
| 13 | 2446192 | 1985-05-06 | 331.64 |
| 14 | 2446525 | 1986-04-04 | 333.65 |
| 15 | 2446857 | 1987-03-02 | 333.6 |
| 16 | 2447190 | 1988-01-29 | 333.65 |
| 17 | 2447530 | 1989-01-03 | 334.1 |
| 21 | 2448875 | 1992-09-09 | 334.45 |
| 22 | 2449200 | 1993-07-31 | 335.3 |
| 23 | 2449535 | 1994-07-01 | 335.05 |
| 24 | 2449864 | 1995-05-26 | 333.53 |
| 25 | 2450207 | 1996-05-03 | 332.65 |
| 26 | 2450546 | 1997-04-07 | 334.25 |
| 27 | 2450875 | 1998-03-02 | 334.1 |
| 28 | 2451200 | 1999-01-21 | 332.35 |
| 32 | 2452530 | 2002-09-12 | 331.55 |
| 33 | 2452890 | 2003-09-07 | 331 |
| 34 | 2453191 | 2004-07-04 | 331.15 |
| 35 | 2453527 | 2005-06-05 | 330.82 |
| 36 | 2453857 | 2006-05-01 | 328.89 |
| 37 | 2454184 | 2007-03-24 | 329.5 |
| 38 | 2454514 | 2008-02-17 | 330.77 |
| 39 | 2454840 | 2009-01-08 | 330.59 |
| 44 | 2456500 | 2013-07-26 | 330.36 |
| 45 | 2456830 | 2014-06-21 | 330.86 |
| 46 | 2457165 | 2015-05-22 | 331.64 |
| 47 | 2457492 | 2016-04-13 | 331.67 |
| 48 | 2457817 | 2017-03-04 | 331.43 |
| 49 | 2458160 | 2018-02-10 | 331.79 |
| 50 | 2458490 | 2019-01-06 | 332 |
| 51 | 2458820 | 2019-12-02 | 332.71 |
| 52 | 2459150 | 2020-10-27 | 332.71 |
| 53 | 2459490 | 2021-10-02 | 331.25 |
| 54 | 2459815 | 2022-08-23 | 331.5 |
| 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. |