| E | O (JD) | O (dat) | Period |
| -80 | 2412840 | 1894-01-11 | 327.77 |
| -72 | 2415474 | 1901-03-30 | 328 |
| -71 | 2415794 | 1902-02-13 | 329.47 |
| -70 | 2416120 | 1903-01-05 | 324.08 |
| -69 | 2416450 | 1903-12-01 | 321.13 |
| -68 | 2416780 | 1904-10-26 | 318.99 |
| -67 | 2417120 | 1905-10-01 | 318.37 |
| -65 | 2417670 | 1907-04-04 | 317.24 |
| -64 | 2418030 | 1908-03-29 | 313.68 |
| -63 | 2418342 | 1909-02-04 | 312.81 |
| -62 | 2418666 | 1909-12-25 | 318.28 |
| -61 | 2418980 | 1910-11-04 | 320.9 |
| -57 | 2420210 | 1914-03-18 | 319.35 |
| -56 | 2420572 | 1915-03-15 | 320.25 |
| -55 | 2420902 | 1916-02-08 | 321.42 |
| -54 | 2421216 | 1916-12-18 | 324.48 |
| -53 | 2421543 | 1917-11-10 | 326.55 |
| -52 | 2421870 | 1918-10-03 | 324.55 |
| -47 | 2423490 | 1923-03-11 | 324.64 |
| -46 | 2423812 | 1924-01-27 | 325.95 |
| -45 | 2424154 | 1925-01-03 | 325.52 |
| -44 | 2424460 | 1925-11-05 | 326.41 |
| -43 | 2424800 | 1926-10-11 | 329.26 |
| -42 | 2425130 | 1927-09-06 | 328.01 |
| -40 | 2425770 | 1929-06-07 | 328.01 |
| -39 | 2426118 | 1930-05-21 | 329.38 |
| -38 | 2426452 | 1931-04-20 | 328.76 |
| -37 | 2426762 | 1932-02-24 | 329.34 |
| -36 | 2427100 | 1933-01-27 | 327 |
| -35 | 2427430 | 1933-12-23 | 322.22 |
| -34 | 2427760 | 1934-11-18 | 320.06 |
| -33 | 2428080 | 1935-10-04 | 320.5 |
| -30 | 2429040 | 1938-05-21 | 319.78 |
| -29 | 2429330 | 1939-03-07 | 316.66 |
| -28 | 2429645 | 1940-01-16 | 316.28 |
| -27 | 2429986 | 1940-12-22 | 318.5 |
| -26 | 2430300 | 1941-11-01 | 321.68 |
| -22 | 2431540 | 1945-03-25 | 324.32 |
| -20 | 2432207 | 1947-01-21 | 322.58 |
| -19 | 2432557 | 1948-01-06 | 321.72 |
| -18 | 2432890 | 1948-12-04 | 323.19 |
| -17 | 2433220 | 1949-10-30 | 324.69 |
| -2 | 2438024 | 1962-12-25 | 324.54 |
| -1 | 2438348 | 1963-11-14 | 324.27 |
| 0 | 2438682 | 1964-10-13 | 324.21 |
| 6 | 2440650 | 1970-03-04 | 325.68 |
| 7 | 2440990 | 1971-02-07 | 329.5 |
| 8 | 2441319 | 1972-01-02 | 330.09 |
| 9 | 2441650 | 1972-11-28 | 330.53 |
| 10 | 2441970 | 1973-10-14 | 329.29 |
| 11 | 2442310 | 1974-09-19 | 327.93 |
| 12 | 2442642 | 1975-08-17 | 328.86 |
| 13 | 2442970 | 1976-07-10 | 329.79 |
| 14 | 2443280 | 1977-05-16 | 329.86 |
| 15 | 2443620 | 1978-04-21 | 328 |
| 16 | 2443953 | 1979-03-20 | 326.64 |
| 17 | 2444284 | 1980-02-14 | 328.66 |
| 18 | 2444614 | 1981-01-09 | 330.63 |
| 19 | 2444930 | 1981-11-21 | 329.41 |
| 20 | 2445255 | 1982-10-12 | 329.22 |
| 22 | 2445925 | 1984-08-12 | 329.94 |
| 23 | 2446265 | 1985-07-18 | 330.89 |
| 25 | 2446908 | 1987-04-22 | 332 |
| 26 | 2447255 | 1988-04-03 | 331.24 |
| 27 | 2447582 | 1989-02-24 | 329.81 |
| 28 | 2447918 | 1990-01-26 | 330.46 |
| 29 | 2448243 | 1990-12-17 | 330.5 |
| 30 | 2448568 | 1991-11-07 | 330.14 |
| 31 | 2448899 | 1992-10-03 | 331.13 |
| 32 | 2449231 | 1993-08-31 | 330.94 |
| 33 | 2449559 | 1994-07-25 | 330.56 |
| 35 | 2450230 | 1996-05-26 | 330.56 |
| 36 | 2450568 | 1997-04-29 | 330.44 |
| 37 | 2450888 | 1998-03-15 | 330.75 |
| 38 | 2451212 | 1999-02-02 | 329.6 |
| 39 | 2451544 | 1999-12-31 | 326.71 |
| 40 | 2451873 | 2000-11-24 | 325.86 |
| 41 | 2452209 | 2001-10-26 | 325.86 |
| 42 | 2452524 | 2002-09-06 | 325.14 |
| 43 | 2452848 | 2003-07-27 | 324.21 |
| 44 | 2453170 | 2004-06-13 | 322.36 |
| 45 | 2453492 | 2005-05-01 | 320.86 |
| 46 | 2453816 | 2006-03-21 | 320.43 |
| 47 | 2454140 | 2007-02-08 | 319.86 |
| 48 | 2454455 | 2007-12-20 | 319.71 |
| 49 | 2454770 | 2008-10-30 | 320.21 |
| 50 | 2455088 | 2009-09-13 | 319.5 |
| 51 | 2455408 | 2010-07-30 | 317.71 |
| 52 | 2455730 | 2011-06-17 | 318 |
| 53 | 2456061 | 2012-05-13 | 318.86 |
| 54 | 2456368 | 2013-03-16 | 318 |
| 55 | 2456675 | 2014-01-17 | 316.07 |
| 56 | 2457002 | 2014-12-10 | 312.79 |
| 57 | 2457320 | 2015-10-24 | 312.07 |
| 58 | 2457628 | 2016-08-27 | 314.5 |
| 59 | 2457935 | 2017-06-30 | 315.71 |
| 60 | 2458235 | 2018-04-26 | 315.86 |
| 61 | 2458563 | 2019-03-20 | 316 |
| 62 | 2458883 | 2020-02-03 | 316.53 |
| 63 | 2459214 | 2020-12-30 | 320.4 |
| 64 | 2459530 | 2021-11-11 | 322.75 |
| 65 | 2459842 | 2022-09-19 | 321.69 |
| 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. |