| E | O (JD) | O (dat) | Period |
| -71 | 2415630 | 1901-09-02 | 297.19 |
| -70 | 2415920 | 1902-06-19 | 297.14 |
| -67 | 2416825 | 1904-12-10 | 297.17 |
| -66 | 2417120 | 1905-10-01 | 297.29 |
| -65 | 2417420 | 1906-07-28 | 297.38 |
| -56 | 2420085 | 1913-11-13 | 297.29 |
| -55 | 2420385 | 1914-09-09 | 297.24 |
| -51 | 2421575 | 1917-12-12 | 297.12 |
| -44 | 2423660 | 1923-08-28 | 297.59 |
| -43 | 2423960 | 1924-06-23 | 298.01 |
| -39 | 2425140 | 1927-09-16 | 298.68 |
| -34 | 2426627 | 1931-10-12 | 299.14 |
| -33 | 2426925 | 1932-08-05 | 299.63 |
| -28 | 2428450 | 1936-10-08 | 300.13 |
| -27 | 2428752 | 1937-08-06 | 300.6 |
| -26 | 2429060 | 1938-06-10 | 301.21 |
| -22 | 2430260 | 1941-09-22 | 300.98 |
| -18 | 2431450 | 1944-12-25 | 300.33 |
| -17 | 2431750 | 1945-10-21 | 299.33 |
| -16 | 2432065 | 1946-09-01 | 299.16 |
| -15 | 2432360 | 1947-06-23 | 298.84 |
| -12 | 2433240 | 1949-11-19 | 298.72 |
| -11 | 2433540 | 1950-09-15 | 298.61 |
| -10 | 2433840 | 1951-07-12 | 298.58 |
| -1 | 2436540 | 1958-12-02 | 298.77 |
| 0 | 2436830 | 1959-09-18 | 298.65 |
| 1 | 2437130 | 1960-07-14 | 298.61 |
| 5 | 2438320 | 1963-10-17 | 298.46 |
| 6 | 2438625 | 1964-08-17 | 298.15 |
| 7 | 2438940 | 1965-06-28 | 297.65 |
| 10 | 2439800 | 1967-11-05 | 297.84 |
| 11 | 2440100 | 1968-08-31 | 297.97 |
| 12 | 2440410 | 1969-07-07 | 298.04 |
| 15 | 2441300 | 1971-12-14 | 298.25 |
| 16 | 2441600 | 1972-10-09 | 298.07 |
| 17 | 2441900 | 1973-08-05 | 298.58 |
| 20 | 2442800 | 1976-01-22 | 298.39 |
| 22 | 2443393 | 1977-09-06 | 297.93 |
| 23 | 2443700 | 1978-07-10 | 297.81 |
| 26 | 2444575 | 1980-12-01 | 297.33 |
| 27 | 2444876 | 1981-09-28 | 296.63 |
| 28 | 2445182 | 1982-07-31 | 296.18 |
| 29 | 2445470 | 1983-05-15 | 296.57 |
| 30 | 2445770 | 1984-03-10 | 296.61 |
| 31 | 2446058 | 1984-12-23 | 297.59 |
| 32 | 2446348 | 1985-10-09 | 297.63 |
| 33 | 2446658 | 1986-08-15 | 297.73 |
| 34 | 2446967 | 1987-06-20 | 299.3 |
| 35 | 2447255 | 1988-04-03 | 299.87 |
| 36 | 2447557 | 1989-01-30 | 300.7 |
| 37 | 2447854 | 1989-11-23 | 300.99 |
| 38 | 2448150 | 1990-09-15 | 300.81 |
| 39 | 2448470 | 1991-08-01 | 301.03 |
| 40 | 2448760 | 1992-05-17 | 301.94 |
| 42 | 2449364 | 1994-01-11 | 302.22 |
| 43 | 2449666 | 1994-11-09 | 302.04 |
| 44 | 2449968 | 1995-09-07 | 301.77 |
| 45 | 2450270 | 1996-07-05 | 300.56 |
| 46 | 2450580 | 1997-05-11 | 300.67 |
| 47 | 2450880 | 1998-03-07 | 300.18 |
| 48 | 2451170 | 1998-12-22 | 299.38 |
| 49 | 2451474 | 1999-10-22 | 299.18 |
| 50 | 2451760 | 2000-08-03 | 298.69 |
| 51 | 2452070 | 2001-06-09 | 298.05 |
| 52 | 2452370 | 2002-04-05 | 298.31 |
| 53 | 2452660 | 2003-01-20 | 298.57 |
| 54 | 2452970 | 2003-11-26 | 298.42 |
| 55 | 2453262 | 2004-09-13 | 298.67 |
| 56 | 2453555 | 2005-07-03 | 298.34 |
| 57 | 2453860 | 2006-05-04 | 298 |
| 58 | 2454156 | 2007-02-24 | 298.05 |
| 59 | 2454454 | 2007-12-19 | 298.02 |
| 60 | 2454755 | 2008-10-15 | 298.35 |
| 61 | 2455055 | 2009-08-11 | 298.43 |
| 62 | 2455342 | 2010-05-25 | 297.98 |
| 63 | 2455645 | 2011-03-24 | 297.66 |
| 64 | 2455950 | 2012-01-23 | 297.45 |
| 65 | 2456244 | 2012-11-12 | 297.28 |
| 66 | 2456543 | 2013-09-07 | 297.63 |
| 67 | 2456836 | 2014-06-27 | 297.9 |
| 68 | 2457129 | 2015-04-16 | 298.04 |
| 69 | 2457430 | 2016-02-11 | 298.23 |
| 70 | 2457728 | 2016-12-05 | 299.28 |
| 71 | 2458033 | 2017-10-06 | 299.51 |
| 72 | 2458327 | 2018-07-27 | 300.02 |
| 73 | 2458634 | 2019-05-30 | 300.33 |
| 74 | 2458930 | 2020-03-21 | 300.3 |
| 75 | 2459240 | 2021-01-25 | 300.31 |
| 76 | 2459527 | 2021-11-08 | 300 |
| 77 | 2459831 | 2022-09-08 | 300.26 |
| 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. |