31 (金)	05:39	11:04	17:01	23:56
	146cm	70cm	172cm	-4cm
中潮 出 07:23 入 18:02 出 04:22 入 15:27

長山（沖縄）2021年12月31日の10分毎の潮の高低差を確認できます。
また1日の潮の高低差が1番大きい（潮の流れが大きい）時間に「最大潮位差」と明記してます。

時刻	潮位	高低差	各ポイント
12/31 00:00	19.2	↑2.2
12/31 00:10	21.7	↑2.5
12/31 00:20	24.7	↑3.0
12/31 00:30	27.9	↑3.2
12/31 00:40	31.5	↑3.6
12/31 00:50	35.4	↑3.9
12/31 01:00	39.6	↑4.2
12/31 01:10	44.0	↑4.4
12/31 01:20	48.7	↑4.7
12/31 01:30	53.5	↑4.8
12/31 01:40	58.5	↑5.0
12/31 01:50	63.6	↑5.1
12/31 02:00	68.9	↑5.3
12/31 02:10	74.1	↑5.2
12/31 02:20	79.4	↑5.3
12/31 02:30	84.7	↑5.3
12/31 02:40	90.0	↑5.3
12/31 02:50	95.2	↑5.2
12/31 03:00	100.3	↑5.1
12/31 03:10	105.2	↑4.9
12/31 03:20	110.0	↑4.8
12/31 03:30	114.5	↑4.5
12/31 03:40	118.8	↑4.3
12/31 03:50	122.9	↑4.1
12/31 04:00	126.7	↑3.8
12/31 04:10	130.2	↑3.5
12/31 04:20	133.3	↑3.1
12/31 04:30	136.1	↑2.8
12/31 04:40	138.6	↑2.5
12/31 04:50	140.6	↑2.0
12/31 05:00	142.3	↑1.7
12/31 05:10	143.6	↑1.3
12/31 05:20	144.5	↑0.9
12/31 05:30	145.0	↑0.5	満潮
12/31 05:40	145.1	↑0.1
12/31 05:50	144.9	↓-0.2
12/31 06:00	144.2	↓-0.7
12/31 06:10	143.2	↓-1.0
12/31 06:20	141.9	↓-1.3
12/31 06:30	140.2	↓-1.7
12/31 06:40	138.2	↓-2.0
12/31 06:50	135.9	↓-2.3
12/31 07:00	133.3	↓-2.6
12/31 07:10	130.5	↓-2.8
12/31 07:20	127.5	↓-3.0
12/31 07:30	124.3	↓-3.2
12/31 07:40	121.0	↓-3.3
12/31 07:50	117.5	↓-3.5
12/31 08:00	114.0	↓-3.5
12/31 08:10	110.4	↓-3.6
12/31 08:20	106.7	↓-3.7
12/31 08:30	103.1	↓-3.6
12/31 08:40	99.5	↓-3.6
12/31 08:50	96.0	↓-3.5
12/31 09:00	92.7	↓-3.3
12/31 09:10	89.4	↓-3.3
12/31 09:20	86.3	↓-3.1
12/31 09:30	83.4	↓-2.9
12/31 09:40	80.7	↓-2.7
12/31 09:50	78.3	↓-2.4
12/31 10:00	76.1	↓-2.2
12/31 10:10	74.2	↓-1.9
12/31 10:20	72.6	↓-1.6
12/31 10:30	71.3	↓-1.3
12/31 10:40	70.3	↓-1.0
12/31 10:50	69.7	↓-0.6
12/31 11:00	69.4	↓-0.3	干潮
12/31 11:10	69.5	↑0.1
12/31 11:20	69.9	↑0.4
12/31 11:30	70.7	↑0.8
12/31 11:40	71.8	↑1.1
12/31 11:50	73.3	↑1.5
12/31 12:00	75.1	↑1.8
12/31 12:10	77.3	↑2.2
12/31 12:20	79.7	↑2.4
12/31 12:30	82.5	↑2.8
12/31 12:40	85.6	↑3.1
12/31 12:50	88.9	↑3.3
12/31 13:00	92.4	↑3.5
12/31 13:10	96.2	↑3.8
12/31 13:20	100.2	↑4.0
12/31 13:30	104.3	↑4.1
12/31 13:40	108.6	↑4.3
12/31 13:50	112.9	↑4.3
12/31 14:00	117.4	↑4.5
12/31 14:10	121.8	↑4.4
12/31 14:20	126.3	↑4.5
12/31 14:30	130.8	↑4.5
12/31 14:40	135.1	↑4.3
12/31 14:50	139.4	↑4.3
12/31 15:00	143.6	↑4.2
12/31 15:10	147.6	↑4.0
12/31 15:20	151.3	↑3.7
12/31 15:30	154.9	↑3.6
12/31 15:40	158.2	↑3.3
12/31 15:50	161.1	↑2.9
12/31 16:00	163.8	↑2.7
12/31 16:10	166.1	↑2.3
12/31 16:20	168.0	↑1.9
12/31 16:30	169.5	↑1.5
12/31 16:40	170.7	↑1.2
12/31 16:50	171.3	↑0.6
12/31 17:00	171.5	↑0.2	満潮
12/31 17:10	171.3	↓-0.2
12/31 17:20	170.6	↓-0.7
12/31 17:30	169.5	↓-1.1
12/31 17:40	167.8	↓-1.7
12/31 17:50	165.7	↓-2.1
12/31 18:00	163.1	↓-2.6
12/31 18:10	160.1	↓-3.0
12/31 18:20	156.7	↓-3.4
12/31 18:30	152.8	↓-3.9
12/31 18:40	148.5	↓-4.3
12/31 18:50	143.9	↓-4.6
12/31 19:00	138.9	↓-5.0
12/31 19:10	133.5	↓-5.4
12/31 19:20	127.9	↓-5.6
12/31 19:30	122.0	↓-5.9
12/31 19:40	115.9	↓-6.1
12/31 19:50	109.5	↓-6.4
12/31 20:00	103.1	↓-6.4
12/31 20:10	96.4	↓-6.7
12/31 20:20	89.8	↓-6.6
12/31 20:30	83.0	↓-6.8	最大潮位差
12/31 20:40	76.3	↓-6.7
12/31 20:50	69.6	↓-6.7
12/31 21:00	63.0	↓-6.6
12/31 21:10	56.6	↓-6.4
12/31 21:20	50.2	↓-6.4
12/31 21:30	44.1	↓-6.1
12/31 21:40	38.2	↓-5.9
12/31 21:50	32.6	↓-5.6
12/31 22:00	27.3	↓-5.3
12/31 22:10	22.3	↓-5.0
12/31 22:20	17.7	↓-4.6
12/31 22:30	13.4	↓-4.3
12/31 22:40	9.6	↓-3.8
12/31 22:50	6.2	↓-3.4
12/31 23:00	3.2	↓-3.0
12/31 23:10	0.7	↓-2.5
12/31 23:20	-1.3	↓-2.0
12/31 23:30	-2.8	↓-1.5
12/31 23:40	-3.8	↓-1.0
12/31 23:50	-4.3	↓-0.5	干潮