| E | O (JD) | O (dat) | Period |
| -81 | 2416160 | 1903-02-14 | 279.3 |
| -80 | 2416450 | 1903-12-01 | 278.52 |
| -76 | 2417530 | 1906-11-15 | 278.31 |
| -72 | 2418660 | 1909-12-19 | 278.63 |
| -63 | 2421180 | 1916-11-12 | 278.22 |
| -51 | 2424500 | 1925-12-15 | 278.4 |
| -47 | 2425630 | 1929-01-18 | 278.87 |
| -46 | 2425910 | 1929-10-25 | 278.65 |
| -42 | 2427010 | 1932-10-29 | 278.9 |
| -39 | 2427850 | 1935-02-16 | 279.79 |
| -38 | 2428140 | 1935-12-03 | 279.47 |
| -34 | 2429255 | 1938-12-22 | 279.39 |
| -30 | 2430370 | 1942-01-10 | 279.47 |
| -29 | 2430672 | 1942-11-08 | 279.32 |
| -4 | 2437636 | 1961-12-02 | 279.2 |
| -3 | 2437915 | 1962-09-07 | 279.03 |
| 0 | 2438744 | 1964-12-14 | 278.54 |
| 1 | 2439033 | 1965-09-29 | 277.96 |
| 4 | 2439860 | 1968-01-04 | 277.56 |
| 8 | 2440971 | 1971-01-19 | 277.5 |
| 9 | 2441240 | 1971-10-15 | 277.12 |
| 12 | 2442078 | 1974-01-30 | 276.76 |
| 15 | 2442910 | 1976-05-11 | 276.77 |
| 16 | 2443184 | 1977-02-09 | 277.42 |
| 17 | 2443461 | 1977-11-13 | 277.68 |
| 18 | 2443735 | 1978-08-14 | 276.78 |
| 20 | 2444292 | 1980-02-22 | 276.88 |
| 21 | 2444577 | 1980-12-03 | 277.32 |
| 22 | 2444850 | 1981-09-02 | 276.68 |
| 23 | 2445120 | 1982-05-30 | 275.66 |
| 24 | 2445404 | 1983-03-10 | 274.5 |
| 25 | 2445678 | 1983-12-09 | 273.5 |
| 26 | 2445945 | 1984-09-01 | 272.92 |
| 27 | 2446217 | 1985-05-31 | 272.21 |
| 28 | 2446495 | 1986-03-05 | 271.93 |
| 29 | 2446761 | 1986-11-26 | 272.94 |
| 30 | 2447030 | 1987-08-22 | 273.8 |
| 31 | 2447305 | 1988-05-23 | 273.79 |
| 32 | 2447584 | 1989-02-26 | 273.92 |
| 33 | 2447860 | 1989-11-29 | 274.57 |
| 34 | 2448135 | 1990-08-31 | 274.21 |
| 35 | 2448410 | 1991-06-02 | 273.28 |
| 36 | 2448681 | 1992-02-28 | 273.42 |
| 37 | 2448954 | 1992-11-27 | 273.71 |
| 38 | 2449220 | 1993-08-20 | 274.67 |
| 39 | 2449495 | 1994-05-22 | 275.45 |
| 40 | 2449777 | 1995-02-28 | 274.94 |
| 41 | 2450050 | 1995-11-28 | 275.43 |
| 43 | 2450615 | 1997-06-15 | 276.76 |
| 44 | 2450883 | 1998-03-10 | 276.55 |
| 45 | 2451151 | 1998-12-03 | 276.17 |
| 46 | 2451430 | 1999-09-08 | 275.47 |
| 48 | 2451990 | 2001-03-21 | 275.19 |
| 49 | 2452260 | 2001-12-16 | 277.25 |
| 50 | 2452538 | 2002-09-20 | 278.26 |
| 51 | 2452810 | 2003-06-19 | 277.75 |
| 52 | 2453091 | 2004-03-26 | 278.37 |
| 53 | 2453379 | 2005-01-08 | 279.19 |
| 54 | 2453654 | 2005-10-10 | 279.59 |
| 56 | 2454210 | 2007-04-19 | 280.11 |
| 57 | 2454494 | 2008-01-28 | 279.5 |
| 58 | 2454771 | 2008-10-31 | 279.17 |
| 60 | 2455330 | 2010-05-13 | 279.77 |
| 61 | 2455613 | 2011-02-20 | 280.2 |
| 62 | 2455888 | 2011-11-22 | 279.75 |
| 63 | 2456170 | 2012-08-30 | 279.46 |
| 64 | 2456450 | 2013-06-06 | 279.35 |
| 65 | 2456737 | 2014-03-20 | 279.35 |
| 66 | 2457004 | 2014-12-12 | 279.35 |
| 67 | 2457289 | 2015-09-23 | 278.57 |
| 68 | 2457565 | 2016-06-25 | 278.07 |
| 69 | 2457847 | 2017-04-03 | 278.65 |
| 70 | 2458122 | 2018-01-03 | 278.3 |
| 71 | 2458398 | 2018-10-06 | 277 |
| 72 | 2458682 | 2019-07-17 | 276.28 |
| 73 | 2458960 | 2020-04-20 | 276.14 |
| 74 | 2459229 | 2021-01-14 | 277.2 |
| 75 | 2459503 | 2021-10-15 | 275.74 |
| 76 | 2459777 | 2022-07-16 | 274.09 |
| 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. |