| E | O (JD) | O (dat) | Period |
| -85 | 2408235 | 1881-06-03 | 418.26 |
| -84 | 2408640 | 1882-07-13 | 418.68 |
| -83 | 2409040 | 1883-08-17 | 419.8 |
| -82 | 2409465 | 1884-10-15 | 420.33 |
| -81 | 2409903 | 1885-12-27 | 420.64 |
| -80 | 2410320 | 1887-02-17 | 420.69 |
| -79 | 2410735 | 1888-04-07 | 421.71 |
| -78 | 2411165 | 1889-06-11 | 421.87 |
| -77 | 2411585 | 1890-08-05 | 420.95 |
| -76 | 2412006 | 1891-09-30 | 419.27 |
| -75 | 2412424 | 1892-11-21 | 419.37 |
| -74 | 2412844 | 1894-01-15 | 417.82 |
| -72 | 2413684 | 1896-05-04 | 416.25 |
| -71 | 2414102 | 1897-06-26 | 416.75 |
| -70 | 2414500 | 1898-07-29 | 416.97 |
| -69 | 2414940 | 1899-10-12 | 417.51 |
| -68 | 2415321 | 1900-10-28 | 419.06 |
| -67 | 2415738 | 1901-12-19 | 420.54 |
| -66 | 2416194 | 1903-03-20 | 420.67 |
| -65 | 2416605 | 1904-05-04 | 419.4 |
| -64 | 2417028 | 1905-07-01 | 419.13 |
| -63 | 2417470 | 1906-09-16 | 419.6 |
| -62 | 2417884 | 1907-11-04 | 419.69 |
| -57 | 2419965 | 1913-07-16 | 419.15 |
| -56 | 2420348 | 1914-08-03 | 419.98 |
| -55 | 2420795 | 1915-10-24 | 420.17 |
| -54 | 2421219 | 1916-12-21 | 419.96 |
| -53 | 2421665 | 1918-03-12 | 421.21 |
| -52 | 2422075 | 1919-04-26 | 423.17 |
| -51 | 2422515 | 1920-07-09 | 422.24 |
| -50 | 2422925 | 1921-08-23 | 419.87 |
| -49 | 2423329 | 1922-10-01 | 418.36 |
| -48 | 2423758 | 1923-12-04 | 416.89 |
| -47 | 2424174 | 1925-01-23 | 416.45 |
| -46 | 2424575 | 1926-02-28 | 416.02 |
| -45 | 2425006 | 1927-05-05 | 417.38 |
| -44 | 2425420 | 1928-06-22 | 419.21 |
| -43 | 2425837 | 1929-08-13 | 419.94 |
| -42 | 2426248 | 1930-09-28 | 421.06 |
| -41 | 2426673 | 1931-11-27 | 422.25 |
| -40 | 2427104 | 1933-01-31 | 423.63 |
| -39 | 2427540 | 1934-04-12 | 426.28 |
| -38 | 2427954 | 1935-05-31 | 427.34 |
| -37 | 2428373 | 1936-07-23 | 428.45 |
| -36 | 2428798 | 1937-09-21 | 427.97 |
| -35 | 2429246 | 1938-12-13 | 427.09 |
| -34 | 2429691 | 1940-03-02 | 426.81 |
| -33 | 2430096 | 1941-04-11 | 426.24 |
| -32 | 2430532 | 1942-06-21 | 426.6 |
| -31 | 2430943 | 1943-08-06 | 425.33 |
| -30 | 2431363 | 1944-09-29 | 423.71 |
| -29 | 2431797 | 1945-12-07 | 423.49 |
| -28 | 2432206 | 1947-01-20 | 424.48 |
| -27 | 2432663 | 1948-04-21 | 423.75 |
| -26 | 2433066 | 1949-05-29 | 423.25 |
| -25 | 2433487 | 1950-07-24 | 422.96 |
| -24 | 2433918 | 1951-09-28 | 422.72 |
| -23 | 2434345 | 1952-11-28 | 421.84 |
| -22 | 2434752 | 1954-01-09 | 420.14 |
| -21 | 2435165 | 1955-02-26 | 420.52 |
| -20 | 2435603 | 1956-05-09 | 419.64 |
| -19 | 2436032 | 1957-07-12 | 419.76 |
| -18 | 2436431 | 1958-08-15 | 420.13 |
| -17 | 2436849 | 1959-10-07 | 421.92 |
| -16 | 2437275 | 1960-12-06 | 422.66 |
| -15 | 2437686 | 1962-01-21 | 423.01 |
| -14 | 2438127 | 1963-04-07 | 424.15 |
| -13 | 2438543 | 1964-05-27 | 424.68 |
| -12 | 2438987 | 1965-08-14 | 424.61 |
| -11 | 2439404 | 1966-10-05 | 424.62 |
| -10 | 2439830 | 1967-12-05 | 424.29 |
| -9 | 2440255 | 1969-02-02 | 422.95 |
| -8 | 2440657 | 1970-03-11 | 422.03 |
| -7 | 2441090 | 1971-05-18 | 420.24 |
| -6 | 2441522 | 1972-07-23 | 420.38 |
| -5 | 2441938 | 1973-09-12 | 419.96 |
| -4 | 2442355 | 1974-11-03 | 418.78 |
| -3 | 2442769 | 1975-12-22 | 418.32 |
| -2 | 2443179 | 1977-02-04 | 416.95 |
| -1 | 2443616 | 1978-04-17 | 416.61 |
| 0 | 2444029 | 1979-06-04 | 417.07 |
| 1 | 2444426 | 1980-07-05 | 417.67 |
| 2 | 2444851 | 1981-09-03 | 417.77 |
| 3 | 2445268 | 1982-10-25 | 418.88 |
| 4 | 2445693 | 1983-12-24 | 419.61 |
| 5 | 2446113 | 1985-02-16 | 421.17 |
| 6 | 2446535 | 1986-04-14 | 422.51 |
| 7 | 2446943 | 1987-05-27 | 422.44 |
| 8 | 2447386 | 1988-08-12 | 422.07 |
| 9 | 2447809 | 1989-10-09 | 421.15 |
| 10 | 2448229 | 1990-12-03 | 420.17 |
| 11 | 2448651 | 1992-01-29 | 419.07 |
| 12 | 2449068 | 1993-03-21 | 418.04 |
| 13 | 2449480 | 1994-05-07 | 416.62 |
| 14 | 2449893 | 1995-06-24 | 416.18 |
| 15 | 2450307 | 1996-08-11 | 416.04 |
| 16 | 2450723 | 1997-10-01 | 415.98 |
| 17 | 2451140 | 1998-11-22 | 417.04 |
| 18 | 2451563 | 2000-01-19 | 418.18 |
| 19 | 2451977 | 2001-03-08 | 418.62 |
| 20 | 2452394 | 2002-04-29 | 417.93 |
| 21 | 2452809 | 2003-06-18 | 418.03 |
| 22 | 2453243 | 2004-08-25 | 417.51 |
| 23 | 2453663 | 2005-10-19 | 416.74 |
| 24 | 2454072 | 2006-12-02 | 416.4 |
| 25 | 2454470 | 2008-01-04 | 415.86 |
| 26 | 2454906 | 2009-03-15 | 415.42 |
| 27 | 2455313 | 2010-04-26 | 414.95 |
| 28 | 2455725 | 2011-06-12 | 416.86 |
| 29 | 2456144 | 2012-08-04 | 418.73 |
| 30 | 2456559 | 2013-09-23 | 420.21 |
| 31 | 2456977 | 2014-11-15 | 421.2 |
| 32 | 2457395 | 2016-01-07 | 423.05 |
| 33 | 2457844 | 2017-03-31 | 423.18 |
| 34 | 2458259 | 2018-05-20 | 423.69 |
| 35 | 2458679 | 2019-07-14 | 424.23 |
| 36 | 2459112 | 2020-09-19 | 424.31 |
| 37 | 2459536 | 2021-11-17 | 423.57 |
| 38 | 2459936 | 2022-12-22 | 420.69 |
| 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. |