The timing of the tides, which should theoretically correspond to the moments of the moon's upper or lower midheaven, is often delayed in practice. The time difference between the occurrence of high tide and the Moon's Upper Midheaven is called the high tide gap. But the climax gap is very different from place to place. For example: Weihai is 10:50, Yantai is 10:25, Longkou is 10:20, which shows that the difference in geographic location leads to the difference in the climax gap. High tide and low tide time of the approximate calculation method: high tide = (day difference) 0 8 × (lunar days) 7-16 (the first half of the month - the second half of the month - 1, 16) + high tide gap, low tide = high tide - 6 hours 12 minutes, such as the calculation of the tide on the first five days of the lunar calendar in Weihai is as follows: high tide = 0.8) × (5-1) + 10: 50′ = 3: 12′ + 10: 50′ = 14: 02′ (i.e., for the The second high tide) 14:02′-12:24′ = 1:38′ (that is, the first high tide) low tide = 14:02′-6:12′ = 7:50′ (that is, the first low tide) above such an algorithm is certainly) accurate, but it is very cumbersome, it is difficult to open mouth on it, we have been practicing for many years on the sea, to verify that we have worked out a very regular and easy to calculate method. The method is the lunar day (the first half of the month -3, the second half of the month -18) x 0.8, that is, the day of the high tide. Such as the calculation of the tide of the first five days of the lunar calendar in Weihai as follows: high tide = (5-3) x 0.8 = 1:36′ (that is, the first high tide). Low tide = 1:36′ + 6:12′ = 7:48′ (then the first low tide). Such as the calculation of Weihai lunar amount of five tide: high tide = (25-18) × 0.8 = 5:36′ (then the first high tide). Low tide = 5:36′ +6:12′ = 11:48′ (then the first low tide) tide is also called tidal current, which is the rise and fall of the water level of the tide letter phenomenon, is due to the role of seawater by the gravitational tidal force occurs after the horizontal flow of the results. Therefore, the tide and tides have the same cyclical pattern of change, but the flow of seawater by the influence of topographic conditions, so often show two states, one is reciprocating, one is rotary. Here we will not talk about the causes of the rotary current, but only introduce the offshore reciprocating current. Reciprocating current (i.e., eastward and westward currents - that is, upward and downward currents, it is in two opposite directions for periodic changes in the tide called reciprocating current. It has been proved by many years of practice, it changes about two hours before the start of the flow along the coast of Shandong Peninsula is the level current (no flow), generally in the high tide about two hours before the west flow, that is, rising tide, the maximum flow rate of the high tide, the high tide of the west about two hours after the end of the flow, about two hours before the low tide east flow, that is, the fall of the tide, low tide flow rate is the maximum low tide, low tide after the end of the east flow of about two hours. From the end of the current to the beginning of the current, there are about two hours of flat current (no current), i.e., the time of turning the current. The above, in the open sea is not necessarily applicable, especially sailing personnel must not be according to this method to draw up sailing plans, this method is only applicable to the coast, especially the Shandong Peninsula is more accurate, the offshore fishing enthusiasts are very practical value.

Main Port Tide Table Catalog No. Province City Port Name Latitude North Longitude East 9036 Macao Macao Macao Harbor 22°13'N 113°33'E 7038 Fujian Dongshan County Dongshan Harbor 23°44'N 117°32'E 7004 Fujian Fuan Saiqi 26°58'N 119°40'E 7013a Fujian Fuqing Fuqing Bay (Songsha Harbor) 25°41'N 119°35'E 7013a Fujian Fuqing Bay(Songsha Harbor) 25°41'N 119°35'E 25°41'N 119°35'E 7021a Fujian Fuqing Langguan 25°34'N 119°18'E 7017 Fujian Fuqing Pingtan(Niangong) 25°28'N 119°50'E 7017a Fujian Fuqing Zhuyu 25°31'N 119°44'E 7013 Fujian Fuzhou Maohuagang 25°58'N 119°28'E 7024 Fujian Huian County Chongwu 24°53'N 118°57'E 7026 Fujian Jinjiang City Shenhu Port 24°37'N 118°40'E 7026a Fujian Jinjiang City Wangtou 24°31'N 118°34'E 7007 Fujian Lianjiang County Huangqi 26°20'N 119°53'E 7010 Fujian Lianjiang County Minjiangkou(Chuanshidao) 26°08'N 119°40'E 7011a Fujian Lianjiang County 闽江口(琯头) 26°08'北 119°34'east 7033 Fujian Longhai City 石码 24°27'N 117°49'east 7006a Fujian Luoyuan County 羅源湾(跡头) 26°28'N 119°41'east 7028 Fujian Nan'an City 石井 24°38'N 118°25'east 7004a Fujian Ningde City 帮门 26°45'N 119°45'N 119°41'E 26°45'N 119°35'E 7021 Fujian Putian Sanjiangkou 25°25'N 119°07'E 7023 Fujian Putian Tiyu 25°08'N 119°02'E 7022a Fujian Putian Xiuyu Port 25°12'N 118°58'E 7025a Fujian Quanzhou Houzhu 24°54'N 118°40'E 7025 Fujian Quanzhou Quanzhou(Shihu) 24°49'N 118°42'E 7032 Fujian Xiamen Xiamen Port 24°27'N 118°04'E 7003 Fujian Xiapu County Sansha 26°55'N 120°13'E 7035a Fujian Zhangpu County Zhanzheng'ao 24°02'N 117°54'E 9107 Guangdong Dianbai County Boga 21°29'N 111°14'E 9109 Guangdong Dianbai County Dianbai (Pengtouling) 21°30'N 111°15'E 9108a Guangdong Dianbai County Xige 21°28'N 111°06'E 9051 Guangdong Guangzhou Guangzhou Harbour 23°05'N 113°14'E 9048 Guangdong Guangzhou Guangzhou Haiqinsha 22°58'N 113°32'E 9049 Guangdong Guangdong Guangzhou Huangpu Harbour 23°06' N 113°28'E 23°06' North 113°28' East 9048a Guangdong Guangzhou Nansha (Buffalo Head) 22°45' North 113°34' East 9045 Guangdong Guangzhou Sampanzhou 22°43' North 113°40' East 9019c Guangdong Huizhou Daya Bay 22°36' North 114°32' East 9019a Guangdong Huizhou Huizhou Port 22°42' North 114°32' East 9019b Guangdong Huizhou Mafenwei (Mafenzi) (East) 22°42' North 114°32' East Huizhou City, Guangdong Whiplash 22°40'N 114°39'E 9071 Guangdong Jiangmen Beijie 22°36'N 113°07'E 9177 Guangdong Leizhou City, Leizhou Liushawan 20°28'N 109°56'E 9178 Guangdong Leizhou City, Leizhou Wushigang 20°33'N 109°50'E 9013 Guangdong Lufeng City, Lufeng City, Kazigang 22°49'N 116°06'E 9109 Guangdong Lufeng City, Lufeng City, Lufeng City, Lufeng City, Lufeng City, Lufeng City, Kazihang 22°49'N 116°06'E 9109a Guangdong Huizhou Port 22°42'N 114°32'E 9019b Guangdong Huizhou City, Huizhou 116°06'E 9108 Guangdong Maoming Maosi(Shuidong Harbour) 21°28'N 111°04'E 9001 Guangdong Nanao County Nanao Island(Yun'ao Bay) 23°24'N 117°06'E 9001a Guangdong Rao Ping County Chaozhou Harbour(Sanbaimen) 23°36'N 116°58'E 9016 Guangdong Shantou Haimen Harbour(Guangdong) 23°11'N 116°37'E 9007 Guangdong 37'E 9007 Guangdong Shantou Shantou Harbour (Manyu) 23°21'N 116°44'E 9180 Guangdong Shanwei Dongsha Island (Dongsha Islands) 20°42'N 116°43'E 9018 Guangdong Shanwei Shanwei Shantou Harbour 22°46'N 115°22'E 9019d Guangdong Shenzhen Dapeng Bay (Yantian Harbour) 22°35'N 114°16'E 9037 Guangdong Shenzhen Shekou Port (Chiwan) 22°28'N 113°53'E 9043a Guangdong Shenzhen Shenzhen Airport (Oil Terminal) 22°38'N 113°48'E 9091 Guangdong Taishan Shangchuan Island (Sanzhouwan) 21°45'N 112°46'E 9122 Guangdong Xuwen County Haian Port 20°16'N 110°13'E 9118 Guangdong Xuwen County Haigang 20°31'N 110°32'E 9103 Guangdong Yangjiang Beijin Harbour 21°48'N 112°01'E 9104 Guangdong Yangjiang Hailingshan Island (Zhapo Harbour) 21°35'N 111°49'E 9114 Guangdong Zhanjiang Scammoniac Island (Beigang) 20°54'N 110°33'E 9182 Guangdong Zhanjiang Haibo (Caotan) 21°16'N 109°46'E 21°16'N 109°46'E 9116 Guangdong Zhanjiang Zhanjiang Harbour 21°11'N 110°24'E 9044 Guangdong Zhongshan City Hengmen 22°35'N 113°31'E 9040a Guangdong Zhuhai City Dawanshan Island 21°56'N 113°43'E 9086 Guangdong Zhuhai City Lantern Mountain 22°14'N 113°24'E 9040 Guangdong Zhuhai City Dong'ao Island 22°01'N 113°42'E 9039 Guangdong Zhuhai Guishan Island 22°08'N 113°49'E 9069 Guangdong Zhuhai Hengshan 22°20'N 113°11'E 9078 Guangdong Zhuhai Jingshi (Baizhao) 22°13'N 113°18'E 9043 Guangdong Zhuhai Neilingding Island 22°25'N 113°48'E 9081 Guangdong Zhuhai Sanzao Island (East) 22°02'N 113°24'E 9038a Guangdong Zhuhai Zhuhai (Jiuzhou Harbor) 22°15'N 113°35'E 9038 Guangdong Zhuhai Zhuhai (Xiangzhou) 22°17'N 113°35'E 9083a Guangdong Zhuhai Zhuhai Harbor 21°56'N 113°14'E 10004 Guangxi Beihai City Beihai Harbor 21°29'N 109°05'E 10002 Guangxi Beihai City Tieshan Harbor (Stone Port) 21°36'N 109°35'E 10003 Guangxi Beihai City Weizhou Island 21°01'N 109°07'E 10011 Guangxi Fangchenggang City Bailongwei 21°30'N 108°14'E 10009 Guangxi Fangchenggang City Fangchenggang 21°36'N 108°20'E 108°20'E 10008 Fangchenggang City, Fangchenggang City, Guangxi, Fortress Point 21°34'N 108°23'E 10010 Fangchenggang City, Fangchenggang City, Guangxi, Yingsha Harbor 21°35'N 108°29'E 10012 Fangchenggang City, Fangchenggang City, Pearl Harbor 21°31'N 108°13'E 10007a Chinchou City, Guangxi, Longlong Island (Qinzhou Harbor) 21°45'N 108°33'E 9170a Hainan Chengmai County, Hainan Ma Cun Harbour 19°57'N 110°02'E 9161 Hainan Danzhou City, Hainan Yangpu Harbour 19°44'N 109°11'E 9157 Hainan Dongfang City, Hainan Dongfang (Basho Harbour) 19°06'N 108°37'E 9172 Hainan Haikou City, Hainan Haikou (Xiuying Harbour) 20°01'N 110°17'E 9154 Hainan Ledong County, Hainan Ingehai 18°30'N 108°43'E 9167 Hainan Lingao Xinying Harbour 19°54'N 109°31'E 9144 Hainan Lingshui Xincun Harbour 18°25'N 109°58'E 9134 Hainan Qionghai Bo'ao 19°12'N 110°36'E 9181 Hainan Sansha Twin Reefs (Spratlys) 11°27'N 114°19'E 9181b Hainan Sansha City 9181b Yongshu Reef (Nansha Islands), Sansha City, Hainan Province 09°32'N 112°53'E 9181a Yongxing Island (Xisha Islands), Sansha City, Hainan Province 16°50'N 112°20'E 9149 Sanya Harbour, Sanya City, Hainan Province 18°14'N 109°30'E 9148a Yalang Harbour, Sanya City, Hainan Province 18°13'N 109°42'E 9123 Hainan Province Wenchang City Baoqian Port 20°02'N 110°34'E 9132 Hainan Wenchang City Qinglan Port 19°34'N 110°49'E 2016 Huanghua City, Hebei Huanghua Port (Phase I Coal Terminal) 38°19'N 117°53'E 2005 Qinhuangdao City, Hebei Qilihai (New Opening) 39°35'N 119°17'E 2003 Qinhuangdao City, Hebei Qinhuangdao Port 39°55'N 119°37'E 2001 Qinhuangdao City, Hebei Shanhaiguan 39°59'N 119°49'E 2008 Tangshan City, Hebei Caofeidian 38°54'N 118°30'E 2006a Tangshan City, Hebei Jingtangang Harbor (Tangshan) 39°13'N 119°01'E 4002 Lianyungang City, Jiangsu Lianyungang City, Jiangsu Lianyungang 34°45'N 119°25'E 4003 Jiangsu Lianyungang City Yanwei Port 34°29'N 119°47'E 4023 Jiangsu Nantong City Lvshi Port 32°08'N 121°37'E 4029 Jiangsu Nantong City Biansheng Port 32°02'N 120°45'E 4021a Jiangsu Nantong City Yangkou Port 32°30'N 121°25'E 4005a Jiangsu Yancheng City Binhai Port 34°16'N 120°16'E 120°16'E 4015a Jiangsu Yancheng City Dafeng Harbor 33°11'N 120°43'E 4020 Jiangsu Yancheng City Snares 32°44'N 120°52'E 4009 Jiangsu Yancheng City Shiyang Estuary 33°49'N 120°30'E 4012 Jiangsu Yancheng City Xinyang Harbor 33°37'N 120°28'E 1025 Liaoning Dalian Dalian ( Tiger Beach) 38°52'N 121°41'E 1022 Dalian, Danyaowan (Nandaosphere) 39°01'N 121°54'E 1028 Dalian, Dalian Huludao (Pulandian Harbor) 39°16'N 121°36'E 1028a Dalian, Jinxian 39°03'N 121°32'E 1025a Dalian, Lushun Xingang 38°48'N 121°08'E 1025a Dalian, Lushun Xingang 38°48'N 121°08'E 1025a Dalian, Jiangsu Yancheng 39°14'N 122°40'E 1001 Dandong Harbor, Dandong City, Dandong, Liaoning Province 40°07'N 124°24'E 1009 Dalu Island, Donggang City, Dandong Province 39°45'N 123°45'E 1005 Donggang City, Dandong, Dandong, Dandong, Dandong, Dandong, Dandong, Xingang 39°50'N 124°09'E 1008 Donggang City, Dandong, Liaoning Province 39°58'N Shishanzi 39°58'N 124°09'E 1008 Donggang City, Donggang, Liaoning Province Shishanzi 39°58'N 123°40'E 1052 Huludao, Liaoning Chrysanthemum Island 40°29'N 120°50'E 1044 Huludao, Liaoning Tuanshanjiao (Erhekou) 40°14'N 120°28'E 1050 Huludao, Liaoning Zhi'anchovy 40°01'N 119°55'E 1051 Jinzhou Harbour (Penjieshan) 40°48' North 121°04'E 1040 Panjin, Liaoning Laobeihekou 40°58'N 121°50'E 1034 Wafangdian, Liaoning Changxingdao 39°39'N 121°28'E 1037 Yingkou, Liaoning Mackerel 40°18'N 122°05'E 1038 Yingkou, Liaoning Yingkou Harbor (Sidougou) 40°38'N 122°09'E 9183 Antarctica Antarctica Great Wall Station 62°13'N 58°57'E 2015 Binzhou City, Shandong Chengkou Outer Sea 38°27'N 118°26'E 3002 Binzhou City, Shandong Dongfeng Harbor (Touer River Mouth) 38°15'N 118°10'E 3007a Dongying City, Shandong Dongying Harbor 38°06'N 118°58'E 3004 Dongying City, Shandong Wanwan Gouou 38°11'N 118°27'E 3054 Shandong Haiyang City Qianliyan 36°16'N 121°23'E 3059 Shandong Jimo City Nidao Harbor 36°22'N 120°52'E 3012a Shandong Laizhou City Laizhou Harbor 37°25'N 119°56'E 3019 Shandong Longkou City Longkou Harbor 37°39'N 120°19'E 3020 Shandong Penglai City Beihuangcheng Island 38°24'N 120°55'E 3024 Shandong Penglai Nanchangshan Island 37°55'N 120°42'E 3025 Shandong Penglai Penglai Harbor 37°49'N 120°44'E 3022 Shandong Penglai Emerald Rocky Island 38°10'N 120°45'E 3063 Shandong Qingdao Huangdao 36°05'N 120°09'E 3062 Shandong Qingdao Qingdao Harbor 36°05'N 120°18'E 3071 Shandong Rizhao Lanshan Harbor 35°05'N 119°22'E 3069 Shandong Rizhao Rizhao Harbor (Shishoushou) 35°22'N 119°33'E 3034 Shandong Rongcheng Chengshanjiao 37°23'N 122°41'E 3043 Shandong Rongcheng Shidao Harbor 36°53'N 122°26'E 3052 Shandong Rongcheng Shidao Harbor 36°53'N 122°26'E 3063 Shandong Huangdao 36°05'N 120°09'E 3063 Shandong Huangdao 36°05'N 120°09'E 3064 Shandong Qingdao Harbor 36°05'N 120°18'E 26' East 3052 Shandong Yushan City, Yushankou Port 36°48' North 121°29' East 3030a Shandong Weihai City, Weihai Port 37°31' North 122°08' East 3011a Shandong Weifang City, Weifang Port 37°14' North 119°11' East 3047 Shandong Wendeng City, Zhangjiabu Port 37°01' North 122°10' East 3028 Shandong Yantai City, Yantai Port 37°33' North 121°10' East 3029 Shandong Rongcheng City, Chengshanjiao 37°23' North 122°41' East Yantai Port 37°33'N 121°23'E 5001 Shanghai Chongming County Chongming (Nanbao Town) 31°32'N 121°38'E 5007 Shanghai Shanghai Gaoqiao 31°21'N 121°34'E 5009 Shanghai Shanghai Huangpu Park 31°14'N 121°29'E 5015 Shanghai Shanghai Jingshanzui 30°45'N 121°22'E 5016 Shanghai Shanghai Shanghai Luchao Harbour (Nanhui Mouth) 30°50'N 121°50'E 5014 Shanghai Shanghai Sheshan Island 31°25'N 122°14'E 5006 Shanghai Shanghai Wusong 31°24'N 121°30'E 5011 Shanghai Shanghai Zhongjun 31°07'N 121°54'E 8011 Kaohsiung Kaohsiung Harbour, Kaohsiung City 22°36'N 120°17'E 8001 Taiwan 17'E 8001 Taiwan Keelung City Keelung Harbour 25°09'N 121°44'E 8017 Taiwan Penghu County Magong Harbour (Penghu Island) 23°33'N 119°24'E 2014 Tianjin Tianjin Tianjin Qikou 38°36'N 117°31'E 2012 Tianjin Tianjin Tianjin Tanggu (Tianjin Harbour) 38°59'N 117°47'E 9029 Hong Kong Hong Kong Hong Kong (Victoria Harbour) 22°18'N 114°10'E 6018a Zhejiang Cixi Haihuangshan 30°13'N 121°30'E 6068 Zhejiang Dongtou Huangdaoao 27°57'N 121°02'E 6061 Zhejiang Haimen Haimen (Zhejiang) 28°41'N 121°27'E 6061a Zhejiang Haimen Haimen Harbour (Baisha) 28°42' N 121°38'E 6061a Zhejiang Haimen Haimen Harbour (Baisha) 28°42' N 121°38'E North 121°38'East 6014 Zhejiang Jiaxing Placebo 30°24'North 120°54'East 6011 Zhejiang Jiaxing Chapu Harbor 30°37'North 121°05'East 6065 Zhejiang Yueqing Kanmen Harbor 28°05'North 121°17'East 6037a Zhejiang Ningbo Beilun Harbor 29°56'North 121°51'East 6047 Zhejiang Ningbo Meishan 29°49'North 122°17'East 29°49'N 122°01'E 6035 Ningbo, Ningbo Port 29°53'N 121°33'E 6042 Ningbo, Ningbo Saitoujiao 29°54'N 122°07'E 6036 Ningbo, Ningbo Zhenhai (Xiao-Qutou) 29°59'N 121°44'E 6076 Pingyang County, Zhejiang Nanji Mountain 27°27'N 121°05'E 6073 Rui'an Port 27°27'N 121°05'E Rui'an City, Zhejiang Rui'an Harbour 27°47'N 120°38'E 6057a Sanmen County, Zhejiang Jianjiu Harbour 29°02'N 121°38'E 6059a Sanmen County, Zhejiang Qimen Harbour 29°09'N 121°28'E 6062 Taizhou City, Zhejiang Lower Dachen Island 28°27'N 121°54'E 6063a Wenling City, Zhejiang Dongmen Village 28°20'N 121°13'E 6072a Wenling City, China 6072 Zhejiang Wenzhou Port 28°02'N 120°39'E 6056 Zhejiang Xiangshan County Shipu Port 29°12'N 121°57'E 6052 Zhejiang Xiangshan County Xiangshan Xisize 29°37'N 121°50'E 6060 Zhejiang Xiangshan County Yushan (North Fisherman's Hill) 28°53'N 122°16'E 6005 Zhejiang Zhoushan City Daji Mountain 30°49'N 122°10'E 6021 Daishan, Zhoushan, Zhejiang 30°14'N 122°11'E 6039a Dinghai Harbour, Zhoushan, Zhejiang 30°00'N 122°04'E 6028 Leigang, Zhoushan, Zhejiang 30°04'N 121°51'E 6002 Luhuashan, Zhoushan, Zhejiang (West Luhuadao) 30°49'N 122°36'E 6032 Shenjiamen, Zhoushan, Zhejiang 6032 ZHEJIANG ZHOUSHAN Shenjiamen Harbour 29°56'N 122°18'E 6001 ZHEJIANG ZHOUSHAN Shengshan 30°43'N 122°48'E 6008 ZHEJIANG ZHOUSHAN Tanhushan 30°37'N 121°37'E 6025 ZHEJIANG ZHOUSHAN West Quay 30°07'N 122°08'E 6020 ZHEJIANG ZHOUSHAN Changtu Harbour 30°15'N 122°18'E