StarLogin 8

Various calculations

Clicking on the button Various calculation in the main window opens the following one:











The tabs in A leads respectively to the following sections:

Ephemeris

  • B: coordinates system chosen for the ephemeris calculation.
  • C: area for the visual display of the results.
  • D: area for the digital display of the results.
  • E: Hindu cycles.
  • F: progressed moon.
  • G: Printing button of the results of the selected tab (here aeras C and D are printed in full).
  • H: button to perform the calculations for the selected tab, according to data about the place and to the time and date declared in I, J, K, L, N and P.
  • I: the name of the place considered in the calculations.
  • J: date considered for the calculations by default (the value is transferred automatically to the other input fields of date type in the window. However, we can then change the date in these fields.).
  • K: time considered for the calculations by default (the value is transferred automatically to the other input fields of time type. However, we can then change the time in these fields.).
  • L: latitude of the location in question (automatically transfered to the input fields of latitude type).
  • M: option to display the date and time (local - or legal - or Universal Time).
  • N: longitude of the place in question (similar to latitude note).
  • O: button to calculate the jet lag including the daylight saving time.
  • P: value of jet lag.

Note that the place (areas I, L and N), the date (J) and the time (K) are taken from the corresponding values in the main window.


Distances between planets











Calculating the angle in degrees and distance in astronomical units (1 AU = Earth-Sun distance) between two planets.

The calculation result is shown in C after selecting the planets in A and B


Rise and set of planets











The calculation with the star selected A brings the following results:

  • in B : time of rise of the planet, its set time, its time to pass the meridian, and its positions of rise and set, in the coordinate system of the default configuration of options, in Universal Time (GMT).
  • Graph with the following elements:
    • horizontal yellow line: Line of separation between the geographical area where the sun is visible and the one where it is set.
    • C: Considered geographical location.
    • D: Symbol indicating the boundary of the area where the sun is visible.
      Note : Because the Earth rotates from West to East and on the contrary apparently the planets and the sun revolve from East to West, lines and symbols also turn from East to West (ie from right to left on the map). Therefore, the symbol D moves to the left (and when it reaches the left edge of the map it then can be found at the right end, as we can see by the calculation for increasing hours). So the selected planet rises for places on the map where the yellow line comes on the D side (hence the up arrow placed there in the area where the planet is visible), but sets on the F side.
    • blue dotted line : Ecliptic.
    • E : Earth Location where the selected planet is highest in the sky. In the case of the sun, it is located exactly on the ecliptic.
    • green horizontal dotted line : Equator.
    • F : Symbol indicating the boundary of the area where the sun has set.
    • green vertical dotted line : Meridian zero or Greenwich one.
    • G : Recall about data: the location with the geographical latitude and longitude, and date + time in universal time.

Alignments between three places











Result in zones C and D after entering the values ​​in the A and B input areas for places A, B and C.

Figure E shows an example of locations A, B and C and corresponding angles.


Calendars











  • A : Calendar to convert (the date we want to convert into other calendars appear in blue), with automatic input format of the date in the form 0000-00-00 (year-month-day) except for the Mayan calendar.
  • B : Other calendars.
  • Notes :
    • The Mayan calendar - Tzolkin and Haab can not be edited.
    • For Mayan calendar (or Mayan Long Count)  one must explicitly enter the five numbers of the Mayan date and separate them by a slash ("/" character), such as for the Mayan date "13/0/0/0/0".
    • Only some researchers consider that the 13/0/0/0/0 Mayan date corresponds to December 21, 2012 of the Gregorian calendar. Other experts, according to the origin date that they demonstrate or consider being valid, get a different correspondance.
    • Depending on the value entered for the year, month and day of the selected calendar (in A), some conversions of calendars could return an error message (especially if we choose a day number greater than the number of possible days in the given month of the selected calendar).

Various calculations

Nine different calculations are possible in the 6th tab:

Greenwich Sidereal Time











Calculation of Sidereal Time for Greenwich at 0 hours UT in B, for a date entry in A.


Julian day











Converting Gregorian date to Julian Day (from A to B) or vice versa depending on the selected option (indicated by the direction of the arrow).


Decimal and sexagesimal degrees











Converting sexagesimal degrees to decimal ones (from A to B) or vice versa depending on the selected option (indicated by the direction of the arrow).


Geocentric and heliocentric latitudes











After entering the altitude of the considered place in A , converting the geographical latitude in B to astronomical one in C or vice versa depending on the selected option (indicated by the direction of the arrow).


Week day name











Determining the name of the day of the week in B for a date entry in A.


Easter date











Determining the date of Easter in B, for a year entered in A.


Universal and sidereal time











After entering the longitude of the considered place in A and the date in Universal Time in B, convert the universal time to local sidereal time (from C to D) or vice versa, depending on the option (indicated by the direction of the arrow).


Distance units











Conversion of distances from the unit A (blue area) to other units in B (white areas).
In the example image above, we converted one meter into other units.


Number of days between two dates











Determination in C of the number of days between the dates entered in A and B.


Dates of perihelion and aphelion points crossings











Results in C after selecting the indicative year in B and the planet in A.


Dates of orbital nodes crossings











Results in C after selecting the indicative year in B and the planet in A.


Phases and age of the Moon











Results in C and D after selecting the date and time respectively in A and B.


Dates of solar and lunar eclipses











Results in B, C and D after selecting the year in A. The E button is used to calculate the next eclipse.
It remains visible if at least another eclipse is to be calculated for the considered year.


Dates of seasons











Results in B after selecting the year in A.


Asteroids











  • A: Identity of the asteroid;
  • B: to see the first asteroid of the list;
  • C: to see the previous asteroid of the list;
  • D: number of the asteroid among those in the list;
  • E: next asteroid of the list;
  • F: last asteroid in the list;
  • G: remove the current asteroid;
  • H: add an asteroid;
  • I: accept the changes of the values entered in L, M and P areas for the current asteroid (or new one)
  • J: cancel the changes;
  • K: data processing related to asteroids;
  • L: number of the asteroid;
  • M: Fields for values​​
  • N: Reminder of the observation location;
  • O: Results of calculation for the asteroid in question;
  • P: area to display an image about the considered asteroid.

Comets











    • A: Identity of the comet;
    • B: to see the first comet of the list;
    • C: to see the previous comet of the list;
    • D: number of the comet among those in the list;
    • E: next comet of the list;
    • F: last comet in the list;
    • G: remove the current comet;
    • H: add a comet;
    • I: accept the changes of the values entered in L, M and P areas for the current comet (or new one)
    • J: cancel the changes;
    • K: data processing related to comets;
    • L: perihelion date for the considered comet;
    • M: Fields for values​​
    • N: Reminder of the observation location;
    • O: Results of calculation for the comet in question;
    • P: area to display an image about the considered comet.

    Stars











    • A: Identity of the star;
    • B: to see the first star of the list;
    • C: to see the previous star of the list;
    • D: number of the star among those in the list;
    • E: next star of the list;
    • F: last star in the list;
    • G: remove the current star;
    • H: add a star;
    • I: accept the changes of the values entered in L, M and P areas for the current star (or new one)
    • J: cancel the changes;
    • K: data processing related to stars;
    • L: name of the star;
    • M: Fields for values​​
    • N: Reminder of the observation location;
    • O: Results of calculation for the star in question;
    • P: area to display an image about the considered star.

    Distances and angles between two places











    The elements to be entered are in areas A and C for the location A and location B and the results are shown in B.


    Search for the date and the place of the event in an astrological chart











    • A : Approximate year assumed for the date of the astrological event corresponding to the chart for which you don't have the event data (case of astrological charts mentioning for example the birth of such person, but without indicating the date, time and/or the birth place). The supposed year can even be one or two hundred years before the real one, as long as you put in C and D areas the position of at least one non retrograde slow planet (among Saturn, Uranus, Neptune or Pluto).
    • B : Area displaying the result.
    • C : Input area for the position (in degrees) of the planet in its sign. (At the first input line, in the left column, the star is the Sun).
    • D : Astrological sign of the considered planet. (At the first input line, in the left column, the star is the Sun).
    • E : Recall the procedure for entering data.
    • F : Button to clear the areas A, C and D (for all planets, the Ascendant and the Mid-Heaven).

    Hindu cycles

    Results displayed in a HTML document. (See also here).


    Progressed moon

    Results displayed in a HTML document. (See also here).