Polynomial approximations to Delta T, 1620(2000 AD

Details Polynomial approximations to Delta T, 1620(2000 AD Polynomial approximations to Delta T, 1620(2000 AD

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jbaa..110..323m&link_type=abstract

Journal of the British Astronomical Association, vol.110, no.6, 323

Astronomy and Astrophysics

Astronomy

2

Scientific paper

The difference between the uniform Dynamical Time and Universal Time, known as ?T (Delta T), is needed in several astronomical calculations, such as eclipses and occultations, or to reduce measured positions of minor planets to a uniform time scale for the aim of orbital determinations. As Universal Time is based on the variable rotation of the Earth, the quantity ?T reflects the irregularities of that rotation, so it varies slowly but rather irregularly with time. We have done some work on empirical formulae for approximating ?T and have derived a set of polynomials of the 4th order which are accurate to within +/-1 second for the period 1620-2000.

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