2013-04-01 10:33:34 +00:00
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/*
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* Copyright 2013 Daniel Warner <contact@danrw.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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2011-12-16 23:38:28 +00:00
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#ifndef GLOBALS_H_
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#define GLOBALS_H_
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#include <cmath>
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const double kAE = 1.0;
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const double kQ0 = 120.0;
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const double kS0 = 78.0;
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const double kMU = 398600.8;
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const double kXKMPER = 6378.135;
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const double kXJ2 = 1.082616e-3;
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const double kXJ3 = -2.53881e-6;
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const double kXJ4 = -1.65597e-6;
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/*
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* alternative XKE
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* affects final results
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* aiaa-2006-6573
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* const double kXKE = 60.0 / sqrt(kXKMPER * kXKMPER * kXKMPER / kMU);
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* dundee
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* const double kXKE = 7.43669161331734132e-2;
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*/
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const double kXKE = 60.0 / sqrt(kXKMPER * kXKMPER * kXKMPER / kMU);
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const double kCK2 = 0.5 * kXJ2 * kAE * kAE;
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const double kCK4 = -0.375 * kXJ4 * kAE * kAE * kAE * kAE;
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/*
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* alternative QOMS2T
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* affects final results
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* aiaa-2006-6573
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* #define QOMS2T (pow(((Q0 - S0) / XKMPER), 4.0))
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* dundee
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* #define QOMS2T (1.880279159015270643865e-9)
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*/
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const double kQOMS2T = pow(((kQ0 - kS0) / kXKMPER), 4.0);
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const double kS = kAE * (1.0 + kS0 / kXKMPER);
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const double kPI = 3.14159265358979323846264338327950288419716939937510582;
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const double kTWOPI = 2.0 * kPI;
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const double kTWOTHIRD = 2.0 / 3.0;
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const double kTHDT = 4.37526908801129966e-3;
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/*
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* earth flattening
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*/
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const double kF = 1.0 / 298.26;
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/*
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* earth rotation per sideral day
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*/
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const double kOMEGA_E = 1.00273790934;
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const double kAU = 1.49597870691e8;
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const double kSECONDS_PER_DAY = 86400.0;
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const double kMINUTES_PER_DAY = 1440.0;
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const double kHOURS_PER_DAY = 24.0;
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// Jan 1.0 1900 = Jan 1 1900 00h UTC
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const double kEPOCH_JAN1_00H_1900 = 2415019.5;
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// Jan 1.5 1900 = Jan 1 1900 12h UTC
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const double kEPOCH_JAN1_12H_1900 = 2415020.0;
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// Jan 1.5 2000 = Jan 1 2000 12h UTC
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const double kEPOCH_JAN1_12H_2000 = 2451545.0;
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#endif
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