6月21日将迎来日环食天象 观测它你需要这份指南!

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(原标题:6月21日将迎来日环食天象 观测它你需要这份指南!)

(夏)(至)(日)(环)(食)(不)(足)(一)(分)(钟)(,)(观)(测)(它)(需)(要)(这)(份)(指)(南) (本)(报)(记)(者) (赵)(汉)(斌) (通)(讯)(员) (陈) (艳) (天)(象)(早)(知)(道) (太)(阳)(是)(离)(我)(们)(最)(近)(的)(恒)(星)(,)(同)(时)(也)(是)(天)(文)(爱)(好)(者)(重)(点)(关)(注)(对)(象)(之)(一)(。) 6(月)21(日)(,)(我)(们)(将)(迎)(来)(日)(环)(食)(天)(象)(。)(环)(食)(带)(经)(过)(我)(国)(南)(方)(部)(分)(地)(区)(,)(但)(日)(偏)(食)(在)(全)(境)(都)(能)(看)(到)(,)(这)(也)(是)(全)(年)(最)(重)(要)(的)(天)(象)(之)(一)(。) (人)(人)(都)(不)(想)(错)(过)(这)(一)(短)(暂)(而)(难)(得)(的)(时)(刻)(,)(也)(一)(定)(会)(想)(要)(拍)(下)(几)(张)(金)(边)(日)(食)(的)(照)(片)(留)(作)(纪)(念)(,)(那)(么)(对)(于)(普)(通)(爱)(好)(者)(来)(说)(,)(如)(何)(观)(测)(、)(如)(何)(拍)(摄)(日)(食)(就)(成)(了)(近)(期)(讨)(论)(的)(热)(点)(话)(题)(。) (夏)(至)(日)(食)(没)(那)(么)(特)(殊) (此)(次)(金)(边)(日)(食)(的)(发)(生)(时)(间)(正)(好)(是)(夏)(至)(当)(天)(,)(这)(也)(让)(许)(多)(人)(感)(到)(激)(动)(。)(夏)(至)(当)(天)(发)(生)(日)(食)(是)(否)(罕)(见)(?)(对)(于)(观)(测)(而)(言)(是)(否)(具)(有)(特)(殊)(意)(义)(?) (“)(夏)(至)(当)(天)(北)(回)(归)(线)(及)(以)(北)(地)(区)(正)(午)(时)(分)(的)(太)(阳)(最)(高)(,)(这)(一)(天)(发)(生)(日)(食)(,)(太)(阳)(的)(地)(平)(高)(度)(很)(高)(,)(但)(对)(于)(观)(测)(而)(言)(,)(意)(义)(并)(不)(大)(。)(因)(为)(大)(多)(数)(日)(食)(带)(上)(发)(生)(日)(食)(的)(时)(间)(都)(不)(在)(正)(午)(,)(例)(如)(此)(次)(我)(国)(大)(部)(分)(食)(带)(地)(区)(都)(是)(在)(午)(后)(,)(到)(了)(福)(建)(和)(台)(湾)(都)(是)(下)(午)(了)(,)(夏)(至)(日)(太)(阳)(高)(度)(的)(意)(义)(并)(不)(大)(。)(”)(北)(京)(天)(文)(馆)(副)(研)(究)(员)(李)(昕)(表)(示)(。) (事)(实)(上)(,)(夏)(至)(日)(发)(生)(日)(食)(,)(是)(一)(种)(正)(常)(的)(现)(象)(。)(日)(食)(每)(年)(至)(少)(会)(出)(现)2(次)(,)(并)(不)(是)(很)(罕)(见)(的)(天)(文)(现)(象)(。)(这)(次)(比)(较)(特)(殊)(的)(是)(食)(分)(比)(较)(大)(,)(也)(就)(是)(特)(别)(接)(近)(于)(全)(食)(,)(被)(称)(为)(金)(边)(日)(食)(。)(而)(且)(这)(个)(“)(边)(”)(特)(别)(窄)(,)(十)(分)(罕)(见)(,)(这)(才)(是)(此)(次)(日)(食)(的)(真)(正)(特)(殊)(之)(处)(。) (除)(了)(夏)(至)(日)(外)(,)(冬)(至)(日)(也)(会)(“)(偶)(遇)(”)(日)(食)(。)(从)(观)(测)(角)(度)(来)(看)(,)(冬)(至)(日)(食)(的)(观)(测)(效)(果)(更)(好)(,)(因)(为)(假)(设)(地)(月)(距)(离)(相)(同)(,)(冬)(至)(日)(太)(阳)(离)(地)(球)(更)(近)(,)(所)(以)(环)(食)(带)(也)(更)(宽)(,)(能)(够)(“)(一)(饱)(眼)(福)(”)(的)(地)(区)(也)(就)(更)(多)(。) (事)(实)(上)(,)(无)(论)(是)(夏)(至)(日)(还)(是)(冬)(至)(日)(,)(对)(于)(观)(测)(日)(食)(而)(言)(都)(要)(“)(具)(体)(问)(题)(,)(具)(体)(分)(析)(”)(,)(因)(为)(地)(月)(距)(离)(、)(日)(地)(距)(离)(以)(及)(月)(球)(的)(运)(动)(方)(向)(等)(因)(素)(都)(要)(考)(量)(,)(不)(能)(一)(概)(而)(论)(。) (不)(同)(地)(区)(观)(测)(条)(件)(各)(有)(优)(劣) (日)(食)(可)(分)(为)(日)(偏)(食)(、)(日)(环)(食)(和)(日)(全)(食)(。)(“)(此)(次)(的)(金)(边)(日)(食)(,)(就)(是)(食)(分)(非)(常)(接)(近)(于)1(的)(日)(环)(食)(。)(无)(论)(是)(日)(全)(食)(还)(是)(日)(环)(食)(,)(在)(它)(们)(形)(成)(过)(程)(前)(后)(都)(会)(有)(日)(偏)(食)(存)(在)(。)(”)(长)(年)(从)(事)(太)(阳)(物)(理)(学)(研)(究)(的)(中)(国)(科)(学)(院)(云)(南)(天)(文)(台)(研)(究)(员)(屈)(中)(权)(向)(科)(技)(日)(报)(记)(者)(介)(绍)(。) (这)(次)(观)(测)(效)(果)(较)(好)(的)(见)(食)(地)(位)(于)(印)(度)(境)(内)(,)(但)(在)(我)(国)(西)(藏)(,)(观)(测)(效)(果)(也)(不)(错)(。)(在)(西)(藏)(阿)(里)(地)(区)(观)(测)(,)(环)(食)(带)(宽)(度)(只)(有)20(千)(米)(,)(在)(福)(建)(和)(台)(湾)(观)(测)(也)(只)(有)40(千)(米)(。)(金)(边)(日)(食)(稍)(纵)(即)(逝)(,)(西)(藏)(的)(环)(食)(持)(续)(时)(间)(只)(有)40(秒)(,)(东)(部)(中)(心)(线)(附)(近)(的)(见)(食)(时)(间)(也)(不)(超)(过)1(分)(钟)(。) (如)(此)(短)(暂)(且)(壮)(观)(的)(天)(象)(,)(想)(要)(观)(测)(必)(须)(提)(前)(做)(好)(安)(排)(。)(环)(食)(带)(经)(过)(我)(国)(东)(部)(的)(部)(分)(地)(区)(,)(交)(通)(相)(对)(便)(捷)(,)(但)(在)(这)(个)(季)(节)(晴)(天)(的)(概)(率)(较)(小)(;)(青)(藏)(高)(原)(交)(通)(不)(便)(,)(但)(遇)(上)(好)(天)(气)(的)(可)(能)(更)(大)(。) (科)(学)(减)(光)(才)(能)(安)(全)(观)(测) (专)(家)(叮)(嘱)(,)(无)(论)(是)(环)(食)(还)(是)(偏)(食)(阶)(段)(,)(都)(不)(能)(用)(眼)(睛)(直)(接)(看)(太)(阳)(,)(需)(要)(佩)(戴)(专)(用)(的)(太)(阳)(观)(察)(镜)(。)(“)(观)(测)(时)(,)(务)(必)(要)(带)(上)(减)(光)(装)(置)(,)(如)(减)(光)(片)(、)(日)(食)(观)(测)(专)(用)(眼)(镜)(等)(。)(”)(屈)(中)(权)(说)(,)(以)(前)(人)(们)(也)(用)(小)(孔)(成)(像)(原)(理)(观)(测)(,)(但)(效)(果)(不)(如)(加)(减)(光)(装)(置)(的)(照)(相)(机)(和)(望)(远)(镜)(。)(一)(般)(情)(况)(下)(,)(也)(可)(以)(将)(日)(食)(过)(程)(投)(影)(在)(白)(屏)(甚)(至)(地)(面)(上)(观)(看)(。) (为)(什)(么)(不)(能)(用)(黑)(胶)(片)(、)(玻)(璃)(等)(减)(光)(手)(段)(观)(测)(?)(减)(光)(需)(要)(减)(到)(什)(么)(程)(度)(才)(能)(直)(视)(太)(阳)(?)(屈)(中)(权)(说)(,)(在)(日)(食)(早)(期)((食)(既))(和)(接)(近)(复)(圆)(阶)(段)(,)(太)(阳)(辐)(射)(很)(强)(,)(这)(些)(简)(易)(减)(光)(手)(段)(不)(足)(以)(保)(护)(眼)(睛)(。) (正)(规)(日)(食)(观)(测)(镜)(的)(减)(光)(材)(料)(是)(被)(称)(为)(太)(阳)(观)(测)(四)(大)(“)(神)(器)(”)(之)(一)(的)(巴)(德)(太)(阳)(滤)(光)(膜)(,)(戴)(上)(这)(种)(观)(测)(镜)(,)(周)(围)(的)(一)(切)(几)(乎)(都)(看)(不)(到)(了)(,)(只)(有)(观)(看)(太)(阳)(时)(,)(才)(能)(看)(到)(一)(轮)(圆)(圆)(而)(不)(刺)(眼)(的)(太)(阳)(图)(像)(。) (外)(行)(看)(热)(闹)(,)(内)(行)(看)(门)(道)(。)(对)(于)(普)(通)(公)(众)(来)(说)(,)(难)(得)(一)(见)(的)(金)(边)(日)(食)(,)(是)(观)(测)(天)(象)(、)(了)(解)(太)(阳)(的)(好)(时)(机)(;)(对)(天)(文)(工)(作)(者)(来)(说)(,)(是)(进)(一)(步)(研)(究)(太)(阳)(、)(看)(懂)(太)(阳)(的)(难)(得)(机)(会)(。)(日)(食)(是)(观)(测)(太)(阳)(高)(层)(大)(气)(的)(最)(佳)(时)(机)(,)(通)(常)(伴)(有)(复)(杂)(的)(形)(态)(结)(构)(和)(频)(繁)(的)(活)(动)(。)(一)(般)(来)(说)(,)(日)(食)(的)(科)(学)(观)(测)(价)(值)(取)(决)(于)(食)(甚)(时)(月)(亮)(遮)(挡)(太)(阳)(的)(面)(积)(比)(例)(。)(由)(于)(日)(全)(食)(时)(,)(食)(分)(大)(于)1(,)(所)(以)(日)(全)(食)(观)(测)(的)(科)(学)(价)(值)(最)(高)(;)(此)(次)(日)(环)(食)(食)(分)(非)(常)(接)(近)(于)1(,)(已)(经)(很)(接)(近)(于)(日)(全)(食)(,)(所)(以)(其)(科)(学)(观)(测)(价)(值)(也)(很)(高)(。) (观)(测)(要)(点) (天)(象)(名)(称)(:)(金)(边)(日)(食) (食)(分)(数)(据)(:)(此)(次)(日)(食)(食)(分)(达)(到)0.994(,)(即)(太)(阳)(几)(乎)(全)(部)(被)(月)(球)(所)(遮)(挡)(。) (食)(带)(路)(径)(:)(此)(次)(日)(环)(食)(带)(将)(从)(西)(藏)(圣)(湖)(玛)(旁)(雍)(错)(入)(境)(,)(擦)(过)(四)(川)(盆)(地)(南)(部)(,)(经)(贵)(州)(东)(北)(和)(湖)(南)(、)(江)(西)(两)(省)(南)(部)(进)(入)(福)(建)(,)(在)(福)(建)(厦)(门)(入)(海)(,)(最)(后)(横)(穿)(台)(湾)(岛)(离)(开)(我)(国)(。) (日)(食)(时)(间)(:)6(月)21(日)14:40(,)(食)(分)(将)(达)(到)(最)(大)(;)(初)(亏)(时)(间)(随)(观)(测)(地)(点)(由)(西)(向)(东)(大)(约)(在)(北)(京)(时)(间)13:30(到)15:00(之)(间)(,)(日)(环)(食)(发)(生)(,)(即)(食)(甚)(时)(间)(,)(大)(约)(在)15:00(到)16:15(左)(右)(,)(然)(后)(在)(大)(约)16:20(到)17:30(左)(右)(复)(圆)(。) (观)(测)(范)(围)(:)(在)(西)(藏)(阿)(里)(地)(区)(观)(测)(,)(环)(食)(带)(宽)(度)(只)(有)20(千)(米)(,)(在)(福)(建)(和)(台)(湾)(观)(测)(也)(只)(有)40(千)(米)(。) (观)(测)(时)(间)(:)(西)(藏)(的)(环)(食)(持)(续)(时)(间)(只)(有)40(秒)(,)(东)(部)(中)(心)(线)(附)(近)(的)(见)(食)(时)(间)(也)(不)(超)(过)1(分)(钟)(。) (【)(编)(辑):(房)(家)(梁)(】) <!----> 编码:20205290352