| E | O (JD) | O (dat) | Period |
| -64 | 2415344 | 1900-11-20 | 423.8 |
| -62 | 2416210 | 1903-04-05 | 422.45 |
| -61 | 2416624 | 1904-05-23 | 424.82 |
| -60 | 2417044 | 1905-07-17 | 426.19 |
| -59 | 2417456 | 1906-09-02 | 425.66 |
| -57 | 2418322 | 1909-01-15 | 425.94 |
| -56 | 2418724 | 1910-02-21 | 425.21 |
| -55 | 2419193 | 1911-06-05 | 425.61 |
| -54 | 2419622 | 1912-08-07 | 426.7 |
| -53 | 2420018 | 1913-09-07 | 427.17 |
| -52 | 2420460 | 1914-11-23 | 427.36 |
| -51 | 2420860 | 1915-12-28 | 428.42 |
| -50 | 2421294 | 1917-03-06 | 427.85 |
| -49 | 2421746 | 1918-06-01 | 429.27 |
| -48 | 2422164 | 1919-07-24 | 431.02 |
| -47 | 2422603 | 1920-10-05 | 431.07 |
| -46 | 2423038 | 1921-12-14 | 431.56 |
| -45 | 2423463 | 1923-02-12 | 430.35 |
| -44 | 2423892 | 1924-04-16 | 428.58 |
| -43 | 2424324 | 1925-06-22 | 428.74 |
| -42 | 2424752 | 1926-08-24 | 428.29 |
| -41 | 2425178 | 1927-10-24 | 427.43 |
| -40 | 2425604 | 1928-12-23 | 426.96 |
| -39 | 2426020 | 1930-02-12 | 426.25 |
| -38 | 2426465 | 1931-05-03 | 425.15 |
| -37 | 2426894 | 1932-07-05 | 424.73 |
| -36 | 2427304 | 1933-08-19 | 424.41 |
| -35 | 2427731 | 1934-10-20 | 424.35 |
| -34 | 2428154 | 1935-12-17 | 424.24 |
| -33 | 2428569 | 1937-02-04 | 424.47 |
| -32 | 2429001 | 1938-04-12 | 424.16 |
| -31 | 2429425 | 1939-06-10 | 424.13 |
| -30 | 2429854 | 1940-08-12 | 423.76 |
| -29 | 2430277 | 1941-10-09 | 422.69 |
| -28 | 2430720 | 1942-12-26 | 421.81 |
| -27 | 2431114 | 1944-01-24 | 420.58 |
| -26 | 2431535 | 1945-03-20 | 420.69 |
| -25 | 2431964 | 1946-05-23 | 419.81 |
| -24 | 2432368 | 1947-07-01 | 419.75 |
| -23 | 2432792 | 1948-08-28 | 420.26 |
| -22 | 2433214 | 1949-10-24 | 422.11 |
| -21 | 2433654 | 1951-01-07 | 422.82 |
| -20 | 2434054 | 1952-02-11 | 424.44 |
| -19 | 2434483 | 1953-04-15 | 425.45 |
| -18 | 2434914 | 1954-06-20 | 425.66 |
| -17 | 2435339 | 1955-08-19 | 426.71 |
| -16 | 2435765 | 1956-10-18 | 427.29 |
| -15 | 2436210 | 1958-01-06 | 428.52 |
| -14 | 2436617 | 1959-02-17 | 428.97 |
| -13 | 2437045 | 1960-04-20 | 428.51 |
| -12 | 2437490 | 1961-07-09 | 428.68 |
| -11 | 2437913 | 1962-09-05 | 428.87 |
| -10 | 2438339 | 1963-11-05 | 428.25 |
| -9 | 2438779 | 1965-01-18 | 428.85 |
| -8 | 2439189 | 1966-03-04 | 428.65 |
| -7 | 2439627 | 1967-05-16 | 428.59 |
| -6 | 2440060 | 1968-07-22 | 429.77 |
| -5 | 2440475 | 1969-09-10 | 430.31 |
| -4 | 2440910 | 1970-11-19 | 430.72 |
| -3 | 2441344 | 1972-01-27 | 432.16 |
| -2 | 2441779 | 1973-04-06 | 432.08 |
| -1 | 2442219 | 1974-06-20 | 432.98 |
| 0 | 2442643 | 1975-08-18 | 433.56 |
| 1 | 2443075 | 1976-10-23 | 433.78 |
| 2 | 2443517 | 1978-01-08 | 433.69 |
| 3 | 2443939 | 1979-03-06 | 432.63 |
| 4 | 2444385 | 1980-05-25 | 431.8 |
| 5 | 2444810 | 1981-07-24 | 430.95 |
| 6 | 2445254 | 1982-10-11 | 429.66 |
| 7 | 2445681 | 1983-12-12 | 428.52 |
| 8 | 2446093 | 1985-01-27 | 427.98 |
| 9 | 2446526 | 1986-04-05 | 426.76 |
| 10 | 2446947 | 1987-05-31 | 426.31 |
| 11 | 2447374 | 1988-07-31 | 425.62 |
| 12 | 2447805 | 1989-10-05 | 425.96 |
| 13 | 2448234 | 1990-12-08 | 425.83 |
| 14 | 2448656 | 1992-02-03 | 426.02 |
| 15 | 2449081 | 1993-04-03 | 426.46 |
| 16 | 2449505 | 1994-06-01 | 426.25 |
| 17 | 2449934 | 1995-08-04 | 426.24 |
| 18 | 2450347 | 1996-09-20 | 426.15 |
| 19 | 2450793 | 1997-12-10 | 425.79 |
| 20 | 2451219 | 1999-02-09 | 425.55 |
| 21 | 2451638 | 2000-04-03 | 425.27 |
| 22 | 2452068 | 2001-06-07 | 424.6 |
| 23 | 2452488 | 2002-08-01 | 424.4 |
| 24 | 2452904 | 2003-09-21 | 423.97 |
| 25 | 2453334 | 2004-11-24 | 424.11 |
| 26 | 2453759 | 2006-01-23 | 424.58 |
| 27 | 2454177 | 2007-03-17 | 424.89 |
| 28 | 2454607 | 2008-05-20 | 424.79 |
| 29 | 2455041 | 2009-07-28 | 425.01 |
| 30 | 2455457 | 2010-09-17 | 425.15 |
| 31 | 2455886 | 2011-11-20 | 425.15 |
| 32 | 2456313 | 2013-01-20 | 425.16 |
| 33 | 2456723 | 2014-03-06 | 424.85 |
| 34 | 2457157 | 2015-05-14 | 424.83 |
| 35 | 2457590 | 2016-07-20 | 425.54 |
| 36 | 2458008 | 2017-09-11 | 426.56 |
| 37 | 2458433 | 2018-11-10 | 427.33 |
| 38 | 2458859 | 2020-01-10 | 428.05 |
| 39 | 2459286 | 2021-03-12 | 427.88 |
| 40 | 2459717 | 2022-05-17 | 428.2 |
| 41 | 2460160 | 2023-08-03 | 429.57 |
| 42 | 2460580 | 2024-09-26 | 430.54 |
| 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. |