The Sun’s position in the sky

@article{Jenkins2013TheSP,
  title={The Sun’s position in the sky},
  author={Alejandro Jenkins},
  journal={European Journal of Physics},
  year={2013},
  volume={34},
  pages={633-652}
}
We express the position of the Sun in the sky as a function of time and the observer?s geographic coordinates. Our method is based on applying rotation matrices to vectors describing points on the celestial sphere. We also derive direct expressions, as functions of date of the year and geographic latitude, for the duration of daylight, the maximum and minimum altitudes of the Sun, and the cardinal directions to sunrise and sunset. We discuss how to account for the eccentricity of the Earth?s… Expand
Visualization on the Day Night Year Globe
The story about a properly oriented outdoor globe in the hands and minds of Eratosthenes, Jefferson, Milankovic and science educators is presented. Having the same orientation in space as the Earth,Expand
Derivation of Solar Position Formulae
Derivation of the following formulae for solar position as seen from orbiting planet based on a simplified model: sunrise direction formula, solar declination formula, sunrise equation, daylightExpand
Height-dependent sunrise and sunset: Effects and implications of the varying times of occurrence for local ionospheric processes and modelling
Abstract It is well established that the sunrise and sunset periods are of particular importance to ionospheric research and modelling because of the rapid changes in the ionospheric plasma density,Expand
35 minute green flash observed at Little America on 16 October 1929: a retrospective study.
  • J. Lock
  • Physics, Medicine
  • Applied optics
  • 2015
TLDR
The constraints placed on the observation by the Earth-Sun orbital kinematics are examined and it is found that the length of the observation cannot be explained solely by the slowness of the setting rate of the Sun, nor the time required just before the beginning of the Antarctic summer for the top of the sun to set, reach its relative minimum position at the horizon, and then rise back up again. Expand
MATLAB Tool for Analyzing Sun’s Path
TLDR
A method which can track the sun without using any tracking device by calculating sun’s path for given latitude is developed, which will help in determining the exact sun's path for any day of the year. Expand
Seasonal changes in the apparent position of the Sun as elementary applications of vector operations
Many introductory courses in physics face an unpleasant chicken-and-egg problem. One might choose to introduce students to physical quantities such as velocity, acceleration, and momentum inExpand
Energy Management of Solar-Powered Aircraft-Based High Altitude Platform for Wireless Communications
With the increasing interest in wireless communications from solar-powered aircraft-based high altitude platforms (HAPs), it is imperative to assess the feasibility of their deployment in differentExpand
An efficient concentrative photovoltaic solar system with Bayesian selection of optimal solar tracking algorithms
TLDR
This paper proposes a CPV solar system that chooses the most proper solar tracking method among the group of heterogeneous tracking algorithms, based on an inference on the current weather conditions with Bayesian network (BN). Expand
Power feedback strategy based on efficiency trajectory analysis for HCPV sun tracking
TLDR
A control strategy for sun trackers which adapts continuously to different sources of error, avoiding the necessity of any kind of calibration by analyzing the produced electric power to sense the position of the Sun is presented. Expand
Comparison of Solar Radiation Torque and Power Generation of Deployable Solar Panel Configurations on Nanosatellites
TLDR
This study investigated solar radiation torque characteristics resulting from the increased area of solar panels on board the CubeSats and introduced three common deployable solar panel configurations that are commercially available and their reference missions were established for the purpose of comparison. Expand
...
1
2
...

References

SHOWING 1-10 OF 29 REFERENCES
The apparent motion of the Sun revisited
The knowledge of the apparent motion of the Sun - due to the combined effects of the rotation of the Earth around its proper axis and the translation around the Sun - is important both in natural andExpand
Introduction to solar motion geometry on the basis of a simple model
By means of a simple mathematical model developed by the authors, the apparent movement of the Sun can be studied for arbitrary latitudes. Using this model, it is easy to gain insight into variousExpand
Derivation of the solar geometric relationships using vector analysis
The standard mathematical approach used in deriving equations to describe the apparent motion and position of the Sun is spherical trigonometry. Additionally, the derivation of the equations for theExpand
Solar position within Monet's Houses of Parliament
  • J. Baker, J. Thornes
  • Geography
  • Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • 2006
Paintings from Monet's Houses of Parliament London series have been analysed for the quantitative information they contain, by comparing the depicted position of the Sun with Solar geometryExpand
Diurnal motion of the Sun as seen from Mercury
The quantitative description of the motion of the Sun as observed from Mercury is a problem suitable to a variety of classes. The only difficult aspect for introductory students is a determination ofExpand
The sundial problem from a new angle
I present the age-old mathematics of the sundial from a new perspective. Standard approaches consider the problem in the Earth frame and focus on spherical geometry. In this work, I apply a moreExpand
Sunset Science. IV. Low-Altitude Refraction
Established authorities have disagreed about the relative importance of the upper and lower atmosphere in producing astronomical refraction for nearly two centuries. This paper resolves the problemExpand
Astronomical refraction: formulas for all zenith distances
In real-time applications fast and accurate algorithms for calculating astronomical refraction are required. Some of the most widely-used expressions are fast, but numerically unstable, and can notExpand
Solar system dynamics
The Solar System is a complex and fascinating dynamical system. This is the first textbook to describe comprehensively the dynamical features of the Solar System and to provide students with all theExpand
Astronomical refraction and airmass
Standard astronomical refraction is approximated to ±1/2″ by a simple procedure valid to the horizon. In the approximation where absroption and refraction are proportional to the density of the airExpand
...
1
2
3
...