天气预报15天查询> 其他> 如何画晨昏线

如何画晨昏线

更新时间: 2020-09-16 00:00:00     

晨线与太阳光线垂直。过地心做一条与太阳光线的平行线,然后做这条平行线的垂线即可。

晨昏线即晨昏圈,指地球上昼半球和夜半球之间的分界线,是地球的大圆圈。春秋二分,全球昼夜等长;冬夏二至,它同经线交角最大,全球昼夜长短差值最大,由于大气折光作用和太阳视半径的存在,它实际上比大圈略小。

关键词: 如何 晨昏

如有意见、反馈、侵权或投诉等情况,请联系:

电话:
邮箱:

我们将会在48小时内给与处理!

版权所有 Copyright ? 2009-2020 tianqiyubao3.com

页面:/news/view-2775418/ | 耗时:0.6031 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=2775418 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2775418 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2775418 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(3155460,1103851,1304693,191883,1355265,1372671,963315,1531981,1052195,3148359,1070058,1078863,1706428,3254940,1058415,1128957,1070262,1074819,2591573,753674,878956,887881,3024136,2385461,1955643,1548176,1335126,1049576,1321865,1130390) ORDER BY field (ArticleID,3155460,1103851,1304693,191883,1355265,1372671,963315,1531981,1052195,3148359,1070058,1078863,1706428,3254940,1058415,1128957,1070262,1074819,2591573,753674,878956,887881,3024136,2385461,1955643,1548176,1335126,1049576,1321865,1130390)