Equinox And Latitude

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Abstract Sophisticated scientific equipments that allow for accurate and precise measurements of latitude of a particular location are not always easily available. In this paper, we use a simple experimental method that can be conducted by anyone at any location to estimate the latitude of Hanover, New Hampshire. Latitude is an important component in deciding a location’s climate, as this affects the amount of solar energy arriving at that location. By measuring the distance of the shadow of an immobile object with a known height to find the incidence angle of sunray at midday on equinox that can be used as a proxy for the latitude. We conclude that our method gives us as estimate of 43.86o for the incidence angle of sunray at midday on equinox. This means that we according to our experiment, the latitude of Hanover are 43.86o, while the true latitude are 43.7o (99.6% accuracy). I. Introduction In EARS006: Environmental Change, we have been studying the science of human induced as well as natural environmental change on a global scale. In part of the course, we have focused on the climate system and climate change. Latitude, for instance, is a key factor in determining the climate of a particular location, as the incidence angle of sunray will affect the amount of energy reaching the place. In this project, we try to use a scientific method to determine the latitude of Hanover, NH, which according to the Nation Weather Service, is 43.7o. One way is to measure the incidence angle of sunray. While there are sophisticated scientific equipments that allow us to get an accurate and precise measurement of a location’s latitude, these equipments are often expensive and not easily available. Therefore, we use an affordable, albeit time-consuming, method that involves measuring length of shadow to determine the latitude, which is estimating the incidence angle of

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