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node-sgp4's Issues

Results not matching with AGI STK

Maybe there is some understanding issue because of which I am not able to generate correct results. Please help me regarding this.

I have compared the results with AGI STK Desktop application. AGI STK Help Page says

By default, STK utilizes the CSSI SGP4 routine, Version 2008-11-03.

Following is the full description of my usage:

TLE Data:

1 20959U 90103A   14044.72615235  .00000027  00000-0  00000+0 0  2724 
2 20959  54.3261 214.0472 0115346 348.3774  11.3322  2.00583365170051

ECI Data generated from AGI STK software:

Time (UTCG)                    x (km)            y (km)       z (km) 
28 Jul 2017 02:55:06.000    -6749.036399    -14064.485321    21282.805742
28 Jul 2017 02:55:07.000    -6745.397433    -14065.853241    21283.102965
28 Jul 2017 02:55:08.000    -6741.758320    -14067.220855    21283.399727
28 Jul 2017 02:55:09.000    -6738.119061    -14068.588164    21283.696028
28 Jul 2017 02:55:10.000    -6734.479656    -14069.955168    21283.991866
28 Jul 2017 02:55:11.000    -6730.840105    -14071.321867    21284.287243
28 Jul 2017 02:55:12.000    -6727.200408    -14072.688260    21284.582158
28 Jul 2017 02:55:13.000    -6723.560565    -14074.054349    21284.876612
28 Jul 2017 02:55:14.000    -6719.920576    -14075.420132    21285.170603
28 Jul 2017 02:55:15.000    -6716.280441    -14076.785610    21285.464134

My Code( using sgp4.js):

updateEntityToCurrentSimTime: function (time) {
        var date = new Date( "07/28/2017 08:25:05");
        var tleLines = ["1 20959U 90103A   14044.72615235  .00000027  00000-0  00000+0 0  2724",
                        "2 20959  54.3261 214.0472 0115346 348.3774  11.3322  2.00583365170051"];
                         
        var satrec = satellite.twoline2rv(tleLines[0], tleLines[1], SGP4.wgs84());         

        //update current date
        date.setSeconds(date.getSeconds() + time);            
                        
        var posAndVelECI = SGP4.propogate(satrec, 
                date.getUTCFullYear(),
                date.getUTCMonth() + 1,
                date.getUTCDate(),
                date.getUTCHours(),
                date.getUTCMinutes(),
                date.getUTCSeconds());
}

ECI data from my code(using node-SGP4):

28 Jul 2017 02:55:06 GMT 0    -6729.5866812930935    -14090.192704493445    21271.96936623743
28 Jul 2017 02:55:07 GMT 0    -6725.942904316203    -14091.546319840401    21272.272757457344
28 Jul 2017 02:55:08 GMT 0    -6722.298834777502    -14092.899684035756    21272.57569941536
28 Jul 2017 02:55:09 GMT 0    -6718.654766124882    -14094.252688097997    21272.87816771835
28 Jul 2017 02:55:10 GMT 0    -6715.010551711341    -14095.605386498912    21273.180174569126
28 Jul 2017 02:55:11 GMT 0    -6711.366191662035    -14096.9577791936    21273.481719959367
28 Jul 2017 02:55:12 GMT 0    -6707.721686056604    -14098.309866154083    21273.782803884547
28 Jul 2017 02:55:13 GMT 0    -6704.077034974807    -14099.661647352345    21274.083426340152
28 Jul 2017 02:55:14 GMT 0    -6700.432238496194    -14101.013122760449    21274.38358732169
28 Jul 2017 02:55:15 GMT 0    -6696.787150063399    -14102.36434670113    21274.683298872133

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