| E | O (JD) | O (dat) | Period |
| -67 | 2411060 | 1889-02-26 | 453.3 |
| -66 | 2411508 | 1890-05-20 | 453.7 |
| -64 | 2412448 | 1892-12-15 | 451.82 |
| -63 | 2412878 | 1894-02-18 | 450.64 |
| -62 | 2413328 | 1895-05-14 | 449.96 |
| -61 | 2413775 | 1896-08-03 | 448.05 |
| -60 | 2414242 | 1897-11-13 | 446.59 |
| -59 | 2414665 | 1899-01-10 | 445.29 |
| -58 | 2415113 | 1900-04-03 | 445.9 |
| -57 | 2415563 | 1901-06-27 | 445.45 |
| -56 | 2415975 | 1902-08-13 | 445.75 |
| -55 | 2416449 | 1903-11-30 | 446.06 |
| -54 | 2416910 | 1905-03-05 | 448.08 |
| -53 | 2417345 | 1906-05-14 | 448.87 |
| -52 | 2417785 | 1907-07-28 | 447.95 |
| -51 | 2418243 | 1908-10-28 | 448.59 |
| -50 | 2418690 | 1910-01-18 | 447.41 |
| -49 | 2419150 | 1911-04-23 | 446.92 |
| -48 | 2419597 | 1912-07-13 | 447.92 |
| -46 | 2420460 | 1914-11-23 | 447.3 |
| -45 | 2420932 | 1916-03-09 | 446.67 |
| -44 | 2421376 | 1917-05-27 | 446.97 |
| -43 | 2421815 | 1918-08-09 | 447.08 |
| -42 | 2422284 | 1919-11-21 | 447.77 |
| -41 | 2422705 | 1921-01-15 | 448.18 |
| -40 | 2423160 | 1922-04-15 | 446.92 |
| -39 | 2423620 | 1923-07-19 | 447.04 |
| -38 | 2424065 | 1924-10-06 | 447.11 |
| -37 | 2424510 | 1925-12-25 | 446.23 |
| -36 | 2424947 | 1927-03-07 | 446.37 |
| -35 | 2425395 | 1928-05-28 | 444.98 |
| -34 | 2425846 | 1929-08-22 | 444.25 |
| -33 | 2426295 | 1930-11-14 | 444.66 |
| -32 | 2426731 | 1932-01-24 | 444.7 |
| -31 | 2427174 | 1933-04-11 | 444.11 |
| -30 | 2427613 | 1934-06-24 | 443.41 |
| -29 | 2428063 | 1935-09-17 | 442.78 |
| -28 | 2428517 | 1936-12-14 | 442.95 |
| -27 | 2428954 | 1938-02-24 | 443.45 |
| -26 | 2429384 | 1939-04-30 | 443.68 |
| -25 | 2429832 | 1940-07-21 | 443.27 |
| -24 | 2430273 | 1941-10-05 | 441.29 |
| -23 | 2430725 | 1942-12-31 | 439.8 |
| -22 | 2431169 | 1944-03-19 | 440.02 |
| -21 | 2431615 | 1945-06-08 | 440.46 |
| -20 | 2432046 | 1946-08-13 | 441.05 |
| -19 | 2432459 | 1947-09-30 | 440.88 |
| -18 | 2432899 | 1948-12-13 | 441.89 |
| -17 | 2433359 | 1950-03-18 | 443.39 |
| -16 | 2433808 | 1951-06-10 | 444.19 |
| -15 | 2434266 | 1952-09-10 | 445.96 |
| -14 | 2434688 | 1953-11-06 | 447.69 |
| -13 | 2435156 | 1955-02-17 | 447.57 |
| -12 | 2435601 | 1956-05-07 | 446.9 |
| -11 | 2436028 | 1957-07-08 | 446.26 |
| -10 | 2436486 | 1958-10-09 | 446.29 |
| -9 | 2436942 | 1960-01-08 | 446.63 |
| -8 | 2437385 | 1961-03-26 | 446.15 |
| -7 | 2437830 | 1962-06-14 | 447.31 |
| -6 | 2438265 | 1963-08-23 | 448.82 |
| -5 | 2438722 | 1964-11-22 | 448.67 |
| -4 | 2439162 | 1966-02-05 | 449.65 |
| -3 | 2439617 | 1967-05-06 | 450.57 |
| -2 | 2440077 | 1968-08-08 | 452.15 |
| -1 | 2440535 | 1969-11-09 | 453.36 |
| 0 | 2440973 | 1971-01-21 | 452.72 |
| 1 | 2441437 | 1972-04-29 | 450.22 |
| 2 | 2441879 | 1973-07-15 | 447.01 |
| 3 | 2442349 | 1974-10-28 | 443.92 |
| 4 | 2442800 | 1976-01-22 | 442 |
| 5 | 2443231 | 1977-03-28 | 441.35 |
| 6 | 2443635 | 1978-05-06 | 440.06 |
| 7 | 2444074 | 1979-07-19 | 439.8 |
| 8 | 2444513 | 1980-09-30 | 439.55 |
| 9 | 2444966 | 1981-12-27 | 441.36 |
| 10 | 2445422 | 1983-03-28 | 443.45 |
| 11 | 2445860 | 1984-06-08 | 446.35 |
| 12 | 2446303 | 1985-08-25 | 446.48 |
| 13 | 2446746 | 1986-11-11 | 446.67 |
| 14 | 2447201 | 1988-02-09 | 446.28 |
| 15 | 2447636 | 1989-04-19 | 447.04 |
| 16 | 2448104 | 1990-07-31 | 447.63 |
| 17 | 2448533 | 1991-10-03 | 447.72 |
| 18 | 2448987 | 1992-12-30 | 447.93 |
| 19 | 2449430 | 1994-03-18 | 447.47 |
| 20 | 2449895 | 1995-06-26 | 448.14 |
| 21 | 2450330 | 1996-09-03 | 449.07 |
| 22 | 2450775 | 1997-11-22 | 450.76 |
| 23 | 2451229 | 1999-02-19 | 451.31 |
| 24 | 2451668 | 2000-05-03 | 452.03 |
| 25 | 2452131 | 2001-08-09 | 453.47 |
| 26 | 2452601 | 2002-11-22 | 456.04 |
| 27 | 2453049 | 2004-02-13 | 457.62 |
| 28 | 2453498 | 2005-05-07 | 457.94 |
| 29 | 2453950 | 2006-08-02 | 457.55 |
| 30 | 2454427 | 2007-11-22 | 455.75 |
| 31 | 2454893 | 2009-03-02 | 454.04 |
| 32 | 2455349 | 2010-06-01 | 450.87 |
| 33 | 2455791 | 2011-08-17 | 446.67 |
| 34 | 2456234 | 2012-11-02 | 441.97 |
| 35 | 2456677 | 2014-01-19 | 438.24 |
| 36 | 2457125 | 2015-04-12 | 435.97 |
| 37 | 2457528 | 2016-05-19 | 434.62 |
| 38 | 2457953 | 2017-07-18 | 433.86 |
| 39 | 2458384 | 2018-09-22 | 433.15 |
| 40 | 2458840 | 2019-12-22 | 432.81 |
| 41 | 2459278 | 2021-03-04 | 433.54 |
| 42 | 2459709 | 2022-05-09 | 438.17 |
| 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. |