Delta T : Polynomial Approximation of Time Period 1620–2013

المؤلفون المشاركون

Khalid, M.
Zaidi, Faheem
Sultana, Mariam

المصدر

Journal of Astrophysics

العدد

المجلد 2014، العدد 2014 (31 ديسمبر/كانون الأول 2014)، ص ص. 1-4، 4ص.

الناشر

Hindawi Publishing Corporation

تاريخ النشر

2014-07-09

دولة النشر

مصر

عدد الصفحات

4

التخصصات الرئيسية

الفلك
الفيزياء

الملخص EN

The difference between the Uniform Dynamical Time and Universal Time is referred to as ΔT (delta T).

Delta T is used in numerous astronomical calculations, that is, eclipses,and length of day.

It is additionally required to reduce quantified positions of minor planets to a uniform timescale for the purpose of orbital determination.

Since Universal Time is established on the basis of the variable rotation of planet Earth, the quantity ΔT mirrors the unevenness of that rotation, and so it changes slowly, but rather irregularly, as time passes.

We have worked on empirical formulae for estimating ΔT and have discovered a set of polynomials of the 4th order with nine intervals which is accurate within the range of ±0.6 seconds for the duration of years 1620–2013.

نمط استشهاد جمعية علماء النفس الأمريكية (APA)

Khalid, M.& Sultana, Mariam& Zaidi, Faheem. 2014. Delta T : Polynomial Approximation of Time Period 1620–2013. Journal of Astrophysics،Vol. 2014, no. 2014, pp.1-4.
https://search.emarefa.net/detail/BIM-474958

نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)

Khalid, M.…[et al.]. Delta T : Polynomial Approximation of Time Period 1620–2013. Journal of Astrophysics No. 2014 (2014), pp.1-4.
https://search.emarefa.net/detail/BIM-474958

نمط استشهاد الجمعية الطبية الأمريكية (AMA)

Khalid, M.& Sultana, Mariam& Zaidi, Faheem. Delta T : Polynomial Approximation of Time Period 1620–2013. Journal of Astrophysics. 2014. Vol. 2014, no. 2014, pp.1-4.
https://search.emarefa.net/detail/BIM-474958

نوع البيانات

مقالات

لغة النص

الإنجليزية

الملاحظات

Includes bibliographical references

رقم السجل

BIM-474958