// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /************************************************************************ * Copyright (C) 1996-2008, International Business Machines Corporation * * and others. All Rights Reserved. * ************************************************************************ * 2003-nov-07 srl Port from Java */ #ifndef ASTRO_H #define ASTRO_H #include "unicode/utypes.h" #if !UCONFIG_NO_FORMATTING #include "gregoimp.h" // for Math #include "unicode/unistr.h" U_NAMESPACE_BEGIN /** * <code>CalendarAstronomer</code> is a class that can perform the calculations to * determine the positions of the sun and moon, the time of sunrise and * sunset, and other astronomy-related data. The calculations it performs * are in some cases quite complicated, and this utility class saves you * the trouble of worrying about them. * <p> * The measurement of time is a very important part of astronomy. Because * astronomical bodies are constantly in motion, observations are only valid * at a given moment in time. Accordingly, each <code>CalendarAstronomer</code> * object has a <code>time</code> property that determines the date * and time for which its calculations are performed. You can set and * retrieve this property with {@link #setDate setDate}, {@link #getDate getDate} * and related methods. * <p> * Almost all of the calculations performed by this class, or by any * astronomer, are approximations to various degrees of accuracy. The * calculations in this class are mostly modelled after those described * in the book * <a href="http://www.amazon.com/exec/obidos/ISBN=0521356997" target="_top"> * Practical Astronomy With Your Calculator</a>, by Peter J. * Duffett-Smith, Cambridge University Press, 1990. This is an excellent * book, and if you want a greater understanding of how these calculations * are performed it a very good, readable starting point. * <p> * <strong>WARNING:</strong> This class is very early in its development, and * it is highly likely that its API will change to some degree in the future. * At the moment, it basically does just enough to support {@link IslamicCalendar} * and {@link ChineseCalendar}. * * @author Laura Werner * @author Alan Liu * @internal */ class U_I18N_API CalendarAstronomer : public UMemory { … }; U_NAMESPACE_END struct UHashtable; U_NAMESPACE_BEGIN /** * Cache of month -> julian day * @internal */ class CalendarCache : public UMemory { … }; U_NAMESPACE_END #endif #endif
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