diff --git a/2000/rince/README.md b/2000/rince/README.md index 0bf04272e..1831b5d00 100644 --- a/2000/rince/README.md +++ b/2000/rince/README.md @@ -1,11 +1,11 @@ # Astronomically Obfuscated -James Bonfield -MRC Laboratory of Molcular Biology -Hills Road, -Cambridge -CB2 2QH -England +James Bonfield +MRC Laboratory of Molcular Biology +Hills Road +Cambridge +CB2 2QH +England ## To build: @@ -29,10 +29,10 @@ make dmy2jd ## Judges' remarks: This program may have you going around in circles :-) Try running it -first before reading the Selected Author's Comments below. +first before reading the author's remarks below. The judges verified the correctness of output for recent dates -thru visual observation. +through visual observation. ## Author's remarks: @@ -60,7 +60,7 @@ the fraction of a day to skip forward for each screen refresh. I suggest: To display the output (still guessing?) for a given date, specify two arguments. The first argument is as before and the second argument is a -Julian day number (given as a fractional component). Eg: +Julian day number (given as a fractional component). E.g.: ```sh ./rince 0 2441193.6 @@ -70,7 +70,7 @@ Julian day number (given as a fractional component). Eg: A Julian day is defined to be the number of days since January 1st in the year -4712 (4713BC), starting at 12 noon GMT.[1] To aid conversion from our time (GMT) to Julian day there is a supplementary program -named: dmy2jd.c. Run it with "day_float month year" as arguments. See +named: dmy2jd.c. Run it with `day_float month year` as arguments. See below for an example. ### What it does @@ -82,10 +82,12 @@ assure you that the parallax is minimal! The moons are labelled with roman numerals from I to IV. I being the closest to the planet and IV being the furthest. They are: +``` I Io II Europa III Ganymede IV Callisto +``` Amazingly, all it takes is a pair of binoculars to see the Galilean moons, so the results can be experimentally checked. (Note that at present, the @@ -95,8 +97,9 @@ The positions of the moons should be correct for binoculars, but possibly not if you have a telescope or if you are in the southern hemisphere. In that case I suggest that to get the correct image you look at the screen from inside the monitor whilst standing on your head. In case of -confusion, please consult the following chart (*): +confusion, please consult the following chart (\*): +``` N ^ | @@ -104,14 +107,15 @@ confusion, please consult the following chart (*): | v S +``` -(*) Not to scale. +(\*) Not to scale. ### History Galileo discovered the moons in January 1610. -"http://www-isds.jpl.nasa.gov/cwo/cwo_54ga/html/cd/galileo.htm" states -the following: + +states the following: ``` By early 1610, Galileo had further improved his telescope by @@ -157,8 +161,14 @@ Thus we can plot Galileo's discoveries using the following three plots: ``` However we can go one better by seeing what Galileo would have seen if it -wasn't cloudy on the 9th. Try "./rince 0 `./dmy2jd 9.85 1 1610`" to see -what he was missing out on. I wonder what he'd have made of that! +wasn't cloudy on the 9th. Try: + + +```sh +./rince 0 `./dmy2jd 9.85 1 1610` +``` + +to see what he was missing out on. I wonder what he'd have made of that! Galileo discovered the fourth moon a few days later. @@ -171,9 +181,8 @@ IOCCC entry. The year 4713BC was chosen by Joseph Justus Scaliger in the 16th Century, so clearly this program has a long history :-) A more complete description -of the origins of Julian Days can be found at: - -http://aa.usno.navy.mil/AA/faq/docs/millennium.html +of the origins of Julian Days can be found at +. ### Assumptions