| E | O (JD) | O (dat) | Period |
| -68 | 2410580 | 1887-11-04 | 431.11 |
| -66 | 2411418 | 1890-02-19 | 429.76 |
| -62 | 2413148 | 1894-11-15 | 428.87 |
| -61 | 2413592 | 1896-02-02 | 428.4 |
| -60 | 2414033 | 1897-04-18 | 427.67 |
| -58 | 2414874 | 1899-08-07 | 426.99 |
| -57 | 2415284 | 1900-09-21 | 426.23 |
| -56 | 2415709 | 1901-11-20 | 424.41 |
| -55 | 2416139 | 1903-01-24 | 424.11 |
| -53 | 2416983 | 1905-05-17 | 424.41 |
| -51 | 2417830 | 1907-09-11 | 425.15 |
| -50 | 2418260 | 1908-11-14 | 425.75 |
| -49 | 2418685 | 1910-01-13 | 425.66 |
| -47 | 2419543 | 1912-05-20 | 425.46 |
| -46 | 2419970 | 1913-07-21 | 425.75 |
| -45 | 2420390 | 1914-09-14 | 425.7 |
| -44 | 2420819 | 1915-11-17 | 424.5 |
| -43 | 2421238 | 1917-01-09 | 423.86 |
| -42 | 2421660 | 1918-03-07 | 423.22 |
| -41 | 2422092 | 1919-05-13 | 422.97 |
| -39 | 2422943 | 1921-09-10 | 422.97 |
| -38 | 2423345 | 1922-10-17 | 423 |
| -37 | 2423776 | 1923-12-22 | 424.1 |
| -36 | 2424201 | 1925-02-19 | 424.72 |
| -35 | 2424622 | 1926-04-16 | 425.99 |
| -34 | 2425047 | 1927-06-15 | 427.94 |
| -33 | 2425475 | 1928-08-16 | 429.81 |
| -32 | 2425920 | 1929-11-04 | 430.25 |
| -31 | 2426339 | 1930-12-28 | 430.05 |
| -30 | 2426782 | 1932-03-15 | 429.43 |
| -29 | 2427212 | 1933-05-19 | 428.48 |
| -28 | 2427642 | 1934-07-23 | 427.27 |
| -27 | 2428068 | 1935-09-22 | 426.09 |
| -26 | 2428481 | 1936-11-08 | 425.13 |
| -25 | 2428903 | 1938-01-04 | 425.03 |
| -24 | 2429331 | 1939-03-08 | 425.66 |
| -23 | 2429757 | 1940-05-07 | 426.34 |
| -22 | 2430186 | 1941-07-10 | 427.24 |
| -21 | 2430599 | 1942-08-27 | 428.85 |
| -20 | 2431051 | 1943-11-22 | 429.61 |
| -19 | 2431478 | 1945-01-22 | 430.1 |
| -18 | 2431902 | 1946-03-22 | 430.16 |
| -17 | 2432329 | 1947-05-23 | 429.84 |
| -16 | 2432771 | 1948-08-07 | 429.98 |
| -15 | 2433197 | 1949-10-07 | 429.36 |
| -14 | 2433628 | 1950-12-12 | 430.15 |
| -13 | 2434050 | 1952-02-07 | 430.44 |
| -12 | 2434474 | 1953-04-06 | 430.17 |
| -11 | 2434913 | 1954-06-19 | 428.93 |
| -10 | 2435346 | 1955-08-26 | 428.65 |
| -9 | 2435784 | 1956-11-06 | 427.69 |
| -8 | 2436207 | 1958-01-03 | 426.82 |
| -7 | 2436632 | 1959-03-04 | 425.7 |
| -6 | 2437044 | 1960-04-19 | 424.27 |
| -5 | 2437478 | 1961-06-27 | 423.64 |
| -4 | 2437893 | 1962-08-16 | 423.37 |
| -3 | 2438317 | 1963-10-14 | 424.01 |
| -2 | 2438743 | 1964-12-13 | 424.45 |
| -1 | 2439166 | 1966-02-09 | 425.04 |
| 0 | 2439595 | 1967-04-14 | 423.79 |
| 1 | 2440020 | 1968-06-12 | 423.31 |
| 2 | 2440449 | 1969-08-15 | 422.63 |
| 3 | 2440870 | 1970-10-10 | 421.95 |
| 4 | 2441296 | 1971-12-10 | 421.78 |
| 5 | 2441694 | 1973-01-11 | 420.41 |
| 6 | 2442120 | 1974-03-13 | 419.26 |
| 7 | 2442546 | 1975-05-13 | 417.84 |
| 8 | 2442968 | 1976-07-08 | 417.37 |
| 9 | 2443398 | 1977-09-11 | 417.28 |
| 10 | 2443795 | 1978-10-13 | 418.37 |
| 11 | 2444211 | 1979-12-03 | 418.91 |
| 12 | 2444618 | 1981-01-13 | 419.07 |
| 13 | 2445044 | 1982-03-15 | 419.85 |
| 14 | 2445466 | 1983-05-11 | 420.87 |
| 15 | 2445900 | 1984-07-18 | 421.95 |
| 16 | 2446331 | 1985-09-22 | 422.55 |
| 17 | 2446739 | 1986-11-04 | 423.43 |
| 18 | 2447165 | 1988-01-04 | 423.12 |
| 19 | 2447588 | 1989-03-02 | 422.62 |
| 20 | 2447997 | 1990-04-15 | 422.11 |
| 21 | 2448430 | 1991-06-22 | 422.36 |
| 22 | 2448864 | 1992-08-29 | 423.24 |
| 23 | 2449280 | 1993-10-19 | 423.43 |
| 24 | 2449697 | 1994-12-10 | 423.86 |
| 25 | 2450121 | 1996-02-07 | 423.38 |
| 26 | 2450548 | 1997-04-09 | 422.57 |
| 27 | 2450974 | 1998-06-09 | 422.24 |
| 28 | 2451398 | 1999-08-07 | 422.47 |
| 29 | 2451824 | 2000-10-06 | 422.32 |
| 30 | 2452228 | 2001-11-14 | 421.93 |
| 31 | 2452658 | 2003-01-18 | 421.49 |
| 32 | 2453081 | 2004-03-16 | 421.07 |
| 33 | 2453503 | 2005-05-12 | 420.94 |
| 34 | 2453923 | 2006-07-06 | 421.51 |
| 35 | 2454346 | 2007-09-02 | 422.82 |
| 36 | 2454766 | 2008-10-26 | 422.83 |
| 37 | 2455183 | 2009-12-17 | 423.89 |
| 38 | 2455605 | 2011-02-12 | 425.36 |
| 39 | 2456038 | 2012-04-20 | 427.54 |
| 40 | 2456471 | 2013-06-27 | 428.55 |
| 41 | 2456887 | 2014-08-17 | 429.64 |
| 42 | 2457326 | 2015-10-30 | 429.83 |
| 43 | 2457761 | 2017-01-07 | 429.25 |
| 44 | 2458206 | 2018-03-28 | 427.77 |
| 45 | 2458617 | 2019-05-13 | 427.33 |
| 46 | 2459050 | 2020-07-19 | 427 |
| 47 | 2459467 | 2021-09-09 | 425.17 |
| 48 | 2459890 | 2022-11-06 | 423.21 |
| 49 | 2460305 | 2023-12-26 | 420.89 |
| 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. |