Solar elevation angle (for a year) Calculator

Calculates a table of changes in the solar elevation and azimuth angles for a year and draws the chart.

Input negative degree for west longtitude and south latitude.
Daylight Saving time is not taken into consideration.
Solar elevation angle (for a year)
    1. ,
    2. Latitude
    1. (1900~2099),
    2. Time zone
    3. h
    1. Time of observation
    2. h
    3. m

Solar elevation angle (for a year)
azimuth angle: north=0, east=90, south=180, west=270 degree
    Solar elevation angle (for a year)
    [1-10] /98Disp-Num
    [1]  2020/01/09 06:39   Male / 40 years old level / A teacher / A researcher / Very /
    Purpose of use
    To try to predict the shadow from a boundary wall and where it falls across a garden area we are trying to redevelop to help determine which plants can go where. Thank you.
    [2]  2019/08/26 15:55   Male / 60 years old level or over / Others / Very /
    Purpose of use
    I'm building a solar array.
    Rather than doing the bogan thing and just plonk panels on the roof or worse still ask a contractor to use frames, which they would get wrong anyway, I'll bild a roof with the correct angle of elevation to maximise solar energy and therefore what the array returns to me.
    Thanks for a great set of data. I looked long and hard and most sites did not even offer a proper description of what the terminology was referring to let alone a usable calculator. Your site has information in both graphical and tabular form and I'll take it from here.
    Wonderful to find a proper website. Most are useless crap written by bureaucrats living in a parallel universe.
    [3]  2019/05/19 03:38   Male / 30 years old level / Others / A little /
    Purpose of use
    Comparing my manual calculations of solar altitude to online calculators for sundial construction.
    It would be helpful to show which formula/algorithm is used for the calculations, and/or an explanation of which angles were used and how they were derived (ie. which declination angle was used, if so, and how it was derived-or if algorithm was used, if so, which one(s); or are obliquity and ecliptic values being used for accuracy?)
    [4]  2019/05/10 07:32   Male / 60 years old level or over / A retired person / A little /
    Purpose of use
    In order to determine the best tilt angle for a solar array, I want to know the maximum sun elevation for the dates of the solstices and equinoxes for the year.
    In order to determine the best tilt angle for a solar array, I want to know the maximum sun elevation for the dates of the solstices and equinoxes for the year. Unfortunately, the answers given are incorrect e.g. the maximum elevation appears to be in January rather than June for my latitude (50 degrees N).
    [5]  2019/04/30 13:51   Male / 60 years old level or over / A retired person / Not at All /
    Purpose of use
    To determine the length of shade caused in our garden by a wall to be built on our northern boundary (South Africa) Longitude 19.369 and latitude 34.619. A negative input for both lat. and long. was used as requested. According to the results obtained the elevation angle at a certain time is higher in winter than in summer - which is not correct. We require this information to ensure that we plant the correct plant species.

    It is strange that all elevation angles are indicated with a minus.
    Please advise how to solve my problem. Regards, Piet le Roux
    [6]  2019/01/08 07:31   Male / 50 years old level / Others / A little /
    Purpose of use
    Seeking more knowledge
    [7]  2019/01/03 02:34   Male / 30 years old level / An engineer / Useful /
    Purpose of use
    Solar plant estimation
    Dear Team,

    Again thank you for adding illustration as requested, It may be better if there any option like a slider to provide average elevation only when azimuth is zero. That is pure Elevation when sun is at it peak of any solar cycle.

    In current UI to approximately track it using the time bar of the day is very hard and need to take multiple iterations to be confident about elevation sun when it is at the peek.

    And similarly the azimuth of with elevation is zero i.e. azimuth during sunset and sunrise can help to know solar swing and design of tracking system.
    [8]  2018/12/26 15:44   Male / 30 years old level / An engineer / Very /
    Purpose of use
    Solar Engineering
    Dear team,

    Thanks vary much well I have problem in understanding this angels based on the nonmature of this angels. most of the time it create confusion and I have to scribble again to build the confidence about the data.

    I hope there is no mistake in data but just for quick reference if you provide illustration of angle you mention above.

    something like this (

    Just to build confidence that we are on same page about the angles we are taking about.
    [9]  2018/08/08 06:49   Male / 20 years old level / High-school/ University/ Grad student / Useful /
    Purpose of use
    Attempting to to determine for how many hours/day at any given time of year the sun will be at or greater than 30 degrees altitude for a specific location
    While this data is interesting, it isn''t precisely what I was looking for. Does anyone know hoe I can better find the information I am looking for?
    [10]  2018/06/21 22:52   Male / 60 years old level or over / Self-employed people / Useful /
    Purpose of use
    Trying to understand relationship of equinoxes and solstices to places within the tropics where the sun''s altitude should reach (and exceed) 90deg
    I don''t seem to be able to discover any days of the year where the sun''s altitude is 90deg for my place of observation in St.Helena, South Atlantic Ocean (15.9deg South). Can this be right?
    from Keisan
    The maximum value of the sun's altitude is 90deg. (Sun's Altitude <= 90deg)
    The sun's altitude takes almost 90deg in St.Helena in November 2018.


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