Delta T = ET - UT since 1620 according to Astronomical Almanac (2008) pages K8/K9 (!) values from the diagram on the USNO-site http://asa.usno.navy.mil/SecK/DeltaT.html extrapolated by Gernot Burkhardt, ARI/ZAH (*) values until 2050 by F.Espenak NASA RPC 1216 (Mar 1989) cc 16 | 17 | 18 | 19 | 20 | yy|------|------|-------|-------|-------| 00| | +9 | +13.7 | -2.72| +63.83| 01| | +9 | +13.4 | -1.54| +64.09| 02| | +9 | +13.1 | -0.02| +64.30| 03| | +9 | +12.9 | +1.24| +64.47| 04| | +9 | +12.7 | +2.64| +64.57| 05| | +9 | +12.6 | +3.86| +64.69| 06| | +9 | +12.5 | +5.37| +64.85| 07| | +9 | +12.5 | +6.14|!+65.15! 08| | +10 | +12.5 | +7.75|!+65.46! 09| | +10 | +12.5 | +9.13|!+65.77! | | | | | | 10| | +10 | +12.5 | +10.46|!+66.07! 11| | +10 | +12.5 | +11.53|!+66.43! 12| | +10 | +12.5 | +13.36| +75.0*| 13| | +10 | +12.5 | +14.65| +75.8*| 14| | +10 | +12.5 | +16.01| +76.6*| 15| | +10 | +12.5 | +17.20| +77.5*| 16| | +10 | +12.5 | +18.24| +78.3*| 17| | +11 | +12.4 | +19.06| +79.1*| 18| | +11 | +12.3 | +20.25| +80.0*| 19| | +11 | +12.2 | +20.95| +80.9*| | | | | | | 20|+124 | +11 | +12.0 | +21.16| +81.8*| 21|+119 | +11 | +11.7 | +22.25| +83.0*| 22|+115 | +11 | +11.4 | +22.41| +83.9*| 23|+110 | +11 | +11.1 | +23.03| +84.9*| 24|+106 | +11 | +10.6 | +23.49| +85.7*| 25|+102 | +11 | +10.2 | +23.62| +86.6*| 26| +98 | +11 | +9.6 | +23.86| +87.6*| 27| +95 | +11 | +9.1 | +24.49| +88.5*| 28| +91 | +11 | +8.6 | +24.34| +89.4*| 29| +88 | +11 | +8.0 | +24.08| +90.8*| | | | | | | 30| +85 | +11 | +7.5 | +24.02| +91.8*| 31| +82 | +11 | +7.0 | +24.00| +92.7*| 32| +79 | +11 | +6.6 | +23.87| +93.7*| 33| +77 | +11 | +6.3 | +23.95| +94.7*| 34| +74 | +12 | +6.0 | +23.86| +95.7*| 35| +72 | +12 | +5.8 | +23.93| +96.6*| 36| +70 | +12 | +5.7 | +23.73| +97.7*| 37| +67 | +12 | +5.6 | +23.92| +98.7*| 38| +65 | +12 | +5.6 | +23.96| +99.7*| 39| +63 | +12 | +5.6 | +24.02|+101.2*| | | | | | | 40| +62 | +12 | +5.7 | +24.33|+102.3*| 41| +60 | +12 | +5.8 | +24.83|+103.4*| 42| +58 | +12 | +5.9 | +25.30|+104.4*| 43| +57 | +12 | +6.1 | +25.70|+105.5*| 44| +55 | +13 | +6.2 | +26.24|+106.6*| 45| +54 | +13 | +6.3 | +26.77|+107.7*| 46| +53 | +13 | +6.5 | +27.28|+108.7*| 47| +51 | +13 | +6.6 | +27.78|+109.9*| 48| +50 | +13 | +6.8 | +28.25|+111.0*| 49| +49 | +13 | +6.9 | +28.71|+112.6*| | | | | | | 50| +48 | +13 | +7.1 | +29.15|+113.8*| 51| +47 | +14 | +7.2 | +29.57| | 52| +46 | +14 | +7.3 | +29.97| | 53| +45 | +14 | +7.4 | +30.36| | 54| +44 | +14 | +7.5 | +30.72| | 55| +43 | +14 | +7.6 | +31.07| | 56| +42 | +14 | +7.7 | +31.35| | 57| +41 | +14 | +7.7 | +31.68| | 58| +40 | +15 | +7.8 | +32.18| | 59| +38 | +15 | +7.8 | +32.68| | | | | | | | 60| +37 | +15 | +7.88| +33.15| | 61| +36 | +15 | +7.82| +33.59| | 62| +35 | +15 | +7.54| +34.00| | 63| +34 | +15 | +6.97| +34.47| | 64| +33 | +15 | +6.40| +35.03| | 65| +32 | +16 | +6.02| +35.73| | 66| +31 | +16 | +5.41| +36.54| | 67| +30 | +16 | +4.10| +37.43| | 68| +28 | +16 | +2.92| +38.29| | 69| +27 | +16 | +1.82| +39.20| | | | | | | | 70| +26 | +16 | +1.61| +40.18| | 71| +25 | +16 | +0.10| +41.17| | 72| +24 | +16 | -1.02| +42.23| | 73| +23 | +16 | -1.28| +43.37| | 74| +22 | +16 | -2.69| +44.49| | 75| +21 | +17 | -3.24| +45.48| | 76| +20 | +17 | -3.64| +46.46| | 77| +19 | +17 | -4.54| +47.52| | 78| +18 | +17 | -4.71| +48.53| | 79| +17 | +17 | -5.11| +49.59| | | | | | | | 80| +16 | +17 | -5.40| +50.54| | 81| +15 | +17 | -5.42| +51.38| | 82| +14 | +17 | -5.20| +52.17| | 83| +14 | +17 | -5.46| +52.96| | 84| +13 | +17 | -5.46| +53.79| | 85| +12 | +17 | -5.79| +54.34| | 86| +12 | +17 | -5.63| +54.87| | 87| +11 | +17 | -5.64| +55.32| | 88| +11 | +17 | -5.80| +55.82| | 89| +10 | +17 | -5.66| +56.30| | | | | | | | 90| +10 | +17 | -5.87| +56.86| | 91| +10 | +17 | -6.01| +57.57| | 92| +9 | +16 | -6.19| +58.31| | 93| +9 | +16 | -6.64| +59.12| | 94| +9 | +16 | -6.44| +59.98| | 95| +9 | +16 | -6.47| +60.78| | 96| +9 | +15 | -6.09| +61.63| | 97| +9 | +IS | -5.76| +62.29| | 98| +9 | +14 | -4.66| +62.97| | 99| +9 | +14 | -3.74| +63.47| |