| E | O (JD) | O (dat) | Period |
| -90 | 2415530 | 1901-05-25 | 259.74 |
| -88 | 2416050 | 1902-10-27 | 258.42 |
| -87 | 2416320 | 1903-07-24 | 258.63 |
| -84 | 2417094 | 1905-09-05 | 258.58 |
| -81 | 2417865 | 1907-10-16 | 258.66 |
| -80 | 2418133 | 1908-07-10 | 258.74 |
| -70 | 2420700 | 1915-07-21 | 258.67 |
| -67 | 2421490 | 1917-09-18 | 258.59 |
| -60 | 2423294 | 1922-08-27 | 258.49 |
| -59 | 2423560 | 1923-05-20 | 258.5 |
| -57 | 2424080 | 1924-10-21 | 258.36 |
| -56 | 2424335 | 1925-07-03 | 258.43 |
| -53 | 2425110 | 1927-08-17 | 258.58 |
| -50 | 2425871 | 1929-09-16 | 259.12 |
| -49 | 2426140 | 1930-06-12 | 259.44 |
| -47 | 2426651 | 1931-11-05 | 259.86 |
| -46 | 2426910 | 1932-07-21 | 260.44 |
| -43 | 2427715 | 1934-10-04 | 261.17 |
| -42 | 2427973 | 1935-06-19 | 261.59 |
| -39 | 2428751 | 1937-08-05 | 261.56 |
| -38 | 2429010 | 1938-04-21 | 261.89 |
| -36 | 2429534 | 1939-09-27 | 261.47 |
| -35 | 2429800 | 1940-06-19 | 260.78 |
| -33 | 2430315 | 1941-11-16 | 260.79 |
| -32 | 2430583 | 1942-08-11 | 260.64 |
| -31 | 2430850 | 1943-05-05 | 260.12 |
| -29 | 2431360 | 1944-09-26 | 259.82 |
| -28 | 2431620 | 1945-06-13 | 259.35 |
| -26 | 2432140 | 1946-11-15 | 259.13 |
| -25 | 2432397 | 1947-07-30 | 258.81 |
| -24 | 2432650 | 1948-04-08 | 259.75 |
| -22 | 2433179 | 1949-09-19 | 260.09 |
| -21 | 2433430 | 1950-05-28 | 260.53 |
| -19 | 2433950 | 1951-10-30 | 260.78 |
| -18 | 2434210 | 1952-07-16 | 260.99 |
| -1 | 2438639 | 1964-08-31 | 261.07 |
| 0 | 2438902 | 1965-05-21 | 261.06 |
| 3 | 2439705 | 1967-08-02 | 261.13 |
| 4 | 2439964 | 1968-04-17 | 260.95 |
| 6 | 2440488 | 1969-09-23 | 260.69 |
| 7 | 2440740 | 1970-06-02 | 260.22 |
| 10 | 2441520 | 1972-07-21 | 259.87 |
| 13 | 2442300 | 1974-09-09 | 259.2 |
| 14 | 2442545 | 1975-05-12 | 259.3 |
| 16 | 2443067 | 1976-10-15 | 259.42 |
| 17 | 2443340 | 1977-07-15 | 259.88 |
| 19 | 2443860 | 1978-12-17 | 260.19 |
| 20 | 2444110 | 1979-08-24 | 260.74 |
| 21 | 2444375 | 1980-05-15 | 261.02 |
| 23 | 2444895 | 1981-10-17 | 261.27 |
| 24 | 2445160 | 1982-07-09 | 261.17 |
| 26 | 2445680 | 1983-12-11 | 261.3 |
| 27 | 2445946 | 1984-09-02 | 261.26 |
| 28 | 2446200 | 1985-05-14 | 260.74 |
| 29 | 2446477 | 1986-02-15 | 260.07 |
| 30 | 2446730 | 1986-10-26 | 259.6 |
| 31 | 2446983 | 1987-07-06 | 259.03 |
| 32 | 2447240 | 1988-03-19 | 258.56 |
| 33 | 2447500 | 1988-12-04 | 258.7 |
| 34 | 2447754 | 1989-08-15 | 258.11 |
| 35 | 2448021 | 1990-05-09 | 258.9 |
| 36 | 2448275 | 1991-01-18 | 259.53 |
| 37 | 2448535 | 1991-10-05 | 259.55 |
| 38 | 2448800 | 1992-06-26 | 259.61 |
| 39 | 2449050 | 1993-03-03 | 259.95 |
| 40 | 2449318 | 1993-11-26 | 259.83 |
| 41 | 2449579 | 1994-08-14 | 260.53 |
| 42 | 2449832 | 1995-04-24 | 261.13 |
| 43 | 2450094 | 1996-01-11 | 261.71 |
| 44 | 2450359 | 1996-10-02 | 262.34 |
| 45 | 2450616 | 1997-06-16 | 262.56 |
| 46 | 2450886 | 1998-03-13 | 262.77 |
| 47 | 2451152 | 1998-12-04 | 263.05 |
| 48 | 2451415 | 1999-08-24 | 262.08 |
| 49 | 2451674 | 2000-05-09 | 261.05 |
| 50 | 2451940 | 2001-01-30 | 260.35 |
| 51 | 2452196 | 2001-10-13 | 259.81 |
| 52 | 2452460 | 2002-07-04 | 259.68 |
| 53 | 2452705 | 2003-03-06 | 259.83 |
| 54 | 2452964 | 2003-11-20 | 260.63 |
| 55 | 2453227 | 2004-08-09 | 260.78 |
| 56 | 2453496 | 2005-05-05 | 260.75 |
| 57 | 2453757 | 2006-01-21 | 260.19 |
| 58 | 2454018 | 2006-10-09 | 259.25 |
| 59 | 2454290 | 2007-07-08 | 258.36 |
| 60 | 2454540 | 2008-03-14 | 257.08 |
| 61 | 2454790 | 2008-11-19 | 256.2 |
| 62 | 2455041 | 2009-07-28 | 255.74 |
| 63 | 2455285 | 2010-03-29 | 255.75 |
| 64 | 2455557 | 2010-12-26 | 256.39 |
| 65 | 2455808 | 2011-09-03 | 257.67 |
| 66 | 2456070 | 2012-05-22 | 258.91 |
| 67 | 2456325 | 2013-02-01 | 259.66 |
| 68 | 2456588 | 2013-10-22 | 260.3 |
| 69 | 2456855 | 2014-07-16 | 260.27 |
| 70 | 2457110 | 2015-03-28 | 260.57 |
| 71 | 2457373 | 2015-12-16 | 260.94 |
| 72 | 2457629 | 2016-08-28 | 261.1 |
| 73 | 2457893 | 2017-05-19 | 260.83 |
| 74 | 2458156 | 2018-02-06 | 260.98 |
| 75 | 2458411 | 2018-10-19 | 261.69 |
| 76 | 2458682 | 2019-07-17 | 261.81 |
| 77 | 2458938 | 2020-03-29 | 262.13 |
| 78 | 2459196 | 2020-12-12 | 262.11 |
| 79 | 2459464 | 2021-09-06 | 262.32 |
| 80 | 2459731 | 2022-05-31 | 262.97 |
| 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. |