// Global "constants". Only "none" and "Pi" lack underscores

var none   =-1;                  // "None of the above" or "None found"
var Pi     =Math.PI              // 3.14159265358...

var _Gauss_=0.01720209895        // Gaussian gravitational constant "k"
var _tiny_ =1e-6                 // Infinitessimal
var _huge_ =1e3                  // Out of bounds
var max_H  =1.3;                 // Limit for hyperbolas
var max_E  =0.97;                // Limit for ellipitical orbits (Used in orbits.js!)
var _D_    ='\xB0'               // Character for degrees sign
var _q_    ="'"                  // Character for single quote
var _Q_    ='"'                  // Character for double quote
var _Mon_  =new Array('January','February','March','April','May','June', 'July','August','September','October','November','December')
var _wkD_  =new Array('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday')
var _msD_  =86400000             // Number of milliseconds in a day.
var _jsE_  =2440587.5            // JDN of 1970/1/1 00:00 (JavaScript Epoch Date)

// Fundamental Units

var _m_  =             1         // meter   Length
var _s_  =             1         // second  Time
var _g_  =             1         // gram    Mass
var _k_  =             0         // kelvin  Temperature
var _amp_=             1         // ampere  Electric current
var _cd_ =             1         // candela Luminous intensity
var _mol_=             1         // mole    Molarity

// Proportional lengths
var _fm_ =         1e-15         // femtometer
var _pm_ =         1e-12         // picometer
var _an_ =           100*_pm_    // Angstrom
var _nm_ =          1e-9         // nanometer
var _um_ =          1e-6         // micrometer
var _mm_ =          1e-3         // millimeter
var _cm_ =          1e-2         // centimeter
var _in_ =          2.54*_cm_    // inch
var _ft_ =            12*_in_    // foot or feet
var _yd_ =             3*_ft_    // yard
var _km_ =           1e3         // kilometer
var _mi_ =          5280*_ft_    // mile
var _Mm_ =           1e6         // Megameter
var _ls_ =     299792458*_m_     // Light second (exact by definition)
var _gm_ =           1e9         // gigameter
var _lm_ =            60*_ls_    // Light minute
var _au_ =  149978706600*_m_     // Astronomical Unit [AU] (exact by definition)
var _tm_ =          1e12         // Terameter
var _Pm_ =          1e15         // Petameter
var _lh_ =            60*_lm_    // Light hour
var _ld_ =            24*_lh_    // Light day
var _ly_ =        365.25*_ld_    // Light year
var _pc_ = 206264.806246*_au_    // Parsec = AU/tangent(1 arcsecond) (by def.)

// Proprtional times
var  _fs_ =         1e-15         // femtosecond
var  _ps_ =         12-12         // picosecond
var  _ns_ =          1e-9         // picosecond
var  _us_ =          1e-6         // microsecond
var  _ms_ =          1e-3         // millisecond
var  _mn_ =            60*_s_     // minute of time
var  _ks_ =           1e3         // kilosecond (16 2/3 minutes)
var  _hr_ =            60*_mn_    // hour
var  _dy_ =            24*_hr_    // day
var  _wk_ =             7*_dy_    // week
var  _Ms_ =           1e6         // megasecond (11.57407...407... days)
var  _yr_ =        365.25*_dy_    // Standard Julian Year
var  _cy_ =           100*_yr_    // Standard Julian Century
var  _gs_ =           1e9         // gigasecond (31.688087813 years)
var  _ts_ =          1e12         // terasecond (316.88087813 centuries)

// Proportional masses
var  _me_ =     9.109e-28         // mass of an electron
var  _mh_ =     1.673e-24         // mass of a hydrogen atom
var  _pg_ =         1e-12         // picogram
var  _ng_ =          1e-9         // nanogram
var  _ug_ =          1e-6         // microgram
var  _mg_ =          1e-3         // milligram
var  _kg_ =           1e3         // kilogram
var  _lb_ =    (1/2.2046)*_kg_    // pound avoirdupois
var  _oz_ =        (1/16)*_lb_    // ounze   "
var  _grn_=      (1/7000)*_lb_    // grain   "
var  _ton_=          2000*_lb_    // ton
var  _Mg_ =           1e6         // megagram - also known as a metric ton
var  _gg_ =           1e9         // gigagram
var  _tg_ =          1e12         // teragram
var  _geo_=      5.977e21*_Mg_    // Earth mass
var  _sol_=      1.989e27*_Mg_    // Solar mass