| E | O (JD) | O (dat) | Period |
| -78 | 2411225 | 1889-08-10 | 377.45 |
| -72 | 2413506 | 1895-11-08 | 377.35 |
| -71 | 2413872 | 1896-11-08 | 374.68 |
| -69 | 2414641 | 1898-12-17 | 371.82 |
| -68 | 2415001 | 1899-12-12 | 369.83 |
| -67 | 2415372 | 1900-12-18 | 368.29 |
| -66 | 2415758 | 1902-01-08 | 365.72 |
| -60 | 2417967 | 1908-01-26 | 364.52 |
| -55 | 2419783 | 1913-01-15 | 363.45 |
| -52 | 2420855 | 1915-12-23 | 362.8 |
| -48 | 2422299 | 1919-12-06 | 361.94 |
| -47 | 2422647 | 1920-11-18 | 360.81 |
| -46 | 2422991 | 1921-10-28 | 358.94 |
| -45 | 2423361 | 1922-11-02 | 358.28 |
| -44 | 2423715 | 1923-10-22 | 358.95 |
| -43 | 2424078 | 1924-10-19 | 359.82 |
| -42 | 2424445 | 1925-10-21 | 361.5 |
| -41 | 2424796 | 1926-10-07 | 364.11 |
| -40 | 2425161 | 1927-10-07 | 365.5 |
| -39 | 2425527 | 1928-10-07 | 367.38 |
| -38 | 2425889 | 1929-10-04 | 368.68 |
| -37 | 2426260 | 1930-10-10 | 370.49 |
| -36 | 2426655 | 1931-11-09 | 372.56 |
| -35 | 2427017 | 1932-11-05 | 372.52 |
| -34 | 2427389 | 1933-11-12 | 371.7 |
| -33 | 2427757 | 1934-11-15 | 370.9 |
| -32 | 2428141 | 1935-12-04 | 369.69 |
| -31 | 2428519 | 1936-12-16 | 368.66 |
| -30 | 2428866 | 1937-11-28 | 369.14 |
| -29 | 2429225 | 1938-11-22 | 369.12 |
| -28 | 2429599 | 1939-12-01 | 369.24 |
| -27 | 2429970 | 1940-12-06 | 369.51 |
| -26 | 2430345 | 1941-12-16 | 370.1 |
| -25 | 2430721 | 1942-12-27 | 370.97 |
| -24 | 2431089 | 1943-12-30 | 371.47 |
| -23 | 2431460 | 1945-01-04 | 371.19 |
| -22 | 2431836 | 1946-01-15 | 370.41 |
| -21 | 2432198 | 1947-01-12 | 369.88 |
| -20 | 2432562 | 1948-01-11 | 369.61 |
| -19 | 2432946 | 1949-01-29 | 369.91 |
| -18 | 2433314 | 1950-02-01 | 370.44 |
| -17 | 2433672 | 1951-01-25 | 371.13 |
| -16 | 2434047 | 1952-02-04 | 371.99 |
| -15 | 2434418 | 1953-02-09 | 372.09 |
| -14 | 2434794 | 1954-02-20 | 372.19 |
| -13 | 2435172 | 1955-03-05 | 372.69 |
| -12 | 2435547 | 1956-03-14 | 372.45 |
| -11 | 2435917 | 1957-03-19 | 371.7 |
| -10 | 2436282 | 1958-03-19 | 371.12 |
| -9 | 2436662 | 1959-04-03 | 370.29 |
| -8 | 2437030 | 1960-04-05 | 369.71 |
| -7 | 2437389 | 1961-03-30 | 369.39 |
| -6 | 2437763 | 1962-04-08 | 369.49 |
| -5 | 2438135 | 1963-04-15 | 369.89 |
| -4 | 2438502 | 1964-04-16 | 370.35 |
| -3 | 2438873 | 1965-04-22 | 371.26 |
| -2 | 2439241 | 1966-04-25 | 372.55 |
| -1 | 2439614 | 1967-05-03 | 373.45 |
| 0 | 2439990 | 1968-05-13 | 374.28 |
| 1 | 2440368 | 1969-05-26 | 374.6 |
| 2 | 2440739 | 1970-06-01 | 374.52 |
| 3 | 2441121 | 1971-06-18 | 374.35 |
| 4 | 2441500 | 1972-07-01 | 373.51 |
| 5 | 2441872 | 1973-07-08 | 372.46 |
| 6 | 2442236 | 1974-07-07 | 371.28 |
| 7 | 2442607 | 1975-07-13 | 369.75 |
| 8 | 2442981 | 1976-07-21 | 368.19 |
| 9 | 2443346 | 1977-07-21 | 367.13 |
| 10 | 2443715 | 1978-07-25 | 366.82 |
| 11 | 2444081 | 1979-07-26 | 366.22 |
| 12 | 2444438 | 1980-07-17 | 365.35 |
| 13 | 2444806 | 1981-07-20 | 364.25 |
| 14 | 2445172 | 1982-07-21 | 363.77 |
| 15 | 2445544 | 1983-07-28 | 362.71 |
| 16 | 2445900 | 1984-07-18 | 361.01 |
| 17 | 2446263 | 1985-07-16 | 359.9 |
| 18 | 2446618 | 1986-07-06 | 358.66 |
| 19 | 2446985 | 1987-07-08 | 357.09 |
| 20 | 2447335 | 1988-06-22 | 356.06 |
| 21 | 2447676 | 1989-05-29 | 355.95 |
| 22 | 2448042 | 1990-05-30 | 355.17 |
| 23 | 2448403 | 1991-05-26 | 355.17 |
| 24 | 2448747 | 1992-05-04 | 354.46 |
| 25 | 2449108 | 1993-04-30 | 354.01 |
| 26 | 2449469 | 1994-04-26 | 353.17 |
| 27 | 2449812 | 1995-04-04 | 351.76 |
| 28 | 2450176 | 1996-04-02 | 351.35 |
| 29 | 2450517 | 1997-03-09 | 352.41 |
| 30 | 2450862 | 1998-02-17 | 352.24 |
| 31 | 2451209 | 1999-01-30 | 352.9 |
| 32 | 2451562 | 2000-01-18 | 353.79 |
| 33 | 2451922 | 2001-01-12 | 355.57 |
| 34 | 2452297 | 2002-01-22 | 357.47 |
| 35 | 2452636 | 2002-12-27 | 359.45 |
| 36 | 2452999 | 2003-12-25 | 361.21 |
| 37 | 2453349 | 2004-12-09 | 362.85 |
| 38 | 2453733 | 2005-12-28 | 363.88 |
| 39 | 2454083 | 2006-12-13 | 365.55 |
| 40 | 2454457 | 2007-12-22 | 368.17 |
| 41 | 2454826 | 2008-12-25 | 369.55 |
| 42 | 2455200 | 2010-01-03 | 371.61 |
| 43 | 2455561 | 2010-12-30 | 373 |
| 44 | 2455943 | 2012-01-16 | 374.7 |
| 45 | 2456318 | 2013-01-25 | 375.91 |
| 46 | 2456688 | 2014-01-30 | 376.18 |
| 47 | 2457078 | 2015-02-24 | 375.63 |
| 48 | 2457459 | 2016-03-11 | 375.22 |
| 49 | 2457827 | 2017-03-14 | 374.55 |
| 50 | 2458215 | 2018-04-06 | 374.16 |
| 51 | 2458572 | 2019-03-29 | 373.52 |
| 52 | 2458934 | 2020-03-25 | 371.88 |
| 53 | 2459310 | 2021-04-05 | 370.96 |
| 54 | 2459693 | 2022-04-23 | 370.77 |
| 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. |