Earth View

Earth View Horizon and Angle from Horizon to Ecliptic.

Object, Sun and Lunar Rising, Transit and Setting Hours. I have the single Day and Triple Day(Day-1 and Day+1 Input) and the planetary ephemeris inputs all working OK. I do notice some round off error in Meeus's example as compared to mine and it amounts to a couple of minutes. To use, pull down selection box to select the type of rising/setting inputs you have. Solar and Lunar Rising and Setting and new feature Solar Length of Day are now finished.


Inputs and Outputs for Right Ascension/Declination in either decimal degrees or HH:MM:SS for RA and Deg:MM:SS for Declination now allowed.


As an interesting side note, the shortest day, latest sunrise, longest day, earliest sunrise do not correspond to December 21st and June 21st as one would assume. Due to the elliptic nature of the earth's orbit about the sun and the analemma it makes in it's daily position in the sky means that the sunrise min max and sunset min max fall on days before and after the equinox. See this site for more: Dark Days on the USNO.NAVY.MIL site. My calculator can figure this for you by working the dates forward and backward fro the equinoxes to see for you self.


Any normalized (i.e. delta for daylight saving) time position of the sun thru the year. 



This next one shows the suns position thru the year for each of the hour angles. So in the morning and evening the analemma lay on it's side and the top and bottom of the year (equinoxes) do not touch the horizon first. This is what creates this effect.




Solar Rising, Setting, Transit and Length of Day in local time


Lunar Rising, Setting, Transit and Length of Day in local time






Rising and Setting of Venus as a single day input for approximation for stars which have small proper motion. This screen shot also shows the Ecliptic and Horizon of the earth at the TimeDate and location shown.



Again the Venus Rising and Setting case as above, but as a star "triple" coordinate input (Day Day-1 and Day+1).


This screen has the RA-Dec box checked and the Equatorial inputs/outputs are in Hours/Minutes/Seconds and Degrees/Minutes/Seconds instead of degrees.