SUNRISE AND SUNSET POSITIONS CHANGE EVERY DAY

شعبان نظامی نے 'Information Technology' کی ذیل میں اس موضوع کا آغاز کیا، ستمبر 6, 2012

  1. شعبان نظامی قلمکار

    SUNRISE AND SUNSET POSITIONS CHANGE EVERY DAY
    Rosa M. Ros
    "EAAE Summerschools" Working Group
    Technical University of Catalonia (Spain)
    Abstract
    The inclination of the Earth's rotation axis causes the seasons and the position of sunrise and sunset to change every day. The maximum angular distance between two sunrises or two sunsets is the angle between two solstices. This angle changes with the latitude of the place. It is minimum at the equator (where it is equal to ecliptic obliquity), and after that increases according to the absolute value of the latitude until it causes the midnight Sun in the polar area. The main objective of this workshop is to present this phenomenon through images and also to calculate the inclination of the Earth's rotation axis for each latitude. It is enough to take a set of sunset photos in different latitudes to obtain the ecliptic obliquity with an acceptable error. The secondary idea of this workshop consists of studying the relationship between the solar path, the horizon and the latitude, by means of photography.
    http://www.eaae-astronomy.org/WG3-SS/WorkShops/SunSetFot4.jpg

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    The main interest of this workshop is to observe, with a group of photos, that the inclination of the Earth's rotation axis (e=23º 27') causes the duration of the day to change during the year, and as a consequence the sunrise and sunset points change throughout the year. In particular, the first objective was to take a set of photos in different latitudes to show the position changes of sunset points during the year. The photos are the result of co-operation between five different countries (Latvia, Spain, Colombia, Bolivia and Argentina). The same situation appears at sunrise or sunset, so it was decided to work at sunsets because it is always more convenient.
    Theoretical Basis

    In an equatorial city (latitude f=0º), the distance between two sunsets can be, at maximum, 2e (between the June and December solstices, (fig 1).
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