/* Copyright 2002-2017 CS Systèmes d'Information
* Licensed to CS Systèmes d'Information (CS) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* CS licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
*
* This package provides classes to represent simple attitudes.
*
* <p>
* Some force models such as the atmospheric drag or the maneuvers need to
* know the spacecraft orientation in inertial frame. OREKIT uses a simple
* container for {@link org.orekit.attitudes.Attitude Attitude} which
* includes both the geometric part (i.e. rotation) and the kinematic part
* (i.e. the instant spin axis). The components hold by this container
* allow to convert vectors from inertial frame to spacecraft frame along
* with their derivatives. This container is similar in spirit to the various
* extensions of the abstract {@link org.orekit.orbits.Orbit Orbit} class:
* it represents a state at a specific instant.
* </p>
*
* <p>
* Several classical attitude laws are already provided in this package.
* One special implementation is the {@link
* org.orekit.attitudes.AttitudesSequence AttitudesSequence} class which
* handle a set of laws, only one of which being active at any time. The
* active law changes as switch events are triggered.
* </p>
*
* @author Fabien Maussion
* @author Luc Maisonobe
* @author Véronique Pommier-Maurussane
*
*/
package org.orekit.attitudes;