🧭 经纬度：地球的门牌号🧭 Latitude & Longitude: Earth's Street Address
上一片把圆球摊成了平面地图。可地图上密密麻麻，怎么说清“我就在这儿”？🌍 蓝色星球向导接了一单活：把 4 箱补给送到宝藏岛。第一步，先给地球编地址。Last leaf flattened the globe into a flat map. But a map is crowded — how do you say exactly “I am here”? 🌍 Blue Planet Guide has a job on: deliver 4 crates to Treasure Island. Step one — give the planet addresses.
第 1 步：地球的两套线Step 1: Earth's two sets of lines
先看地球仪上那两套线——它们就是地址的“行”和“列”。Start with the two sets of lines on a globe — they are the rows and columns of the address.
竖着的叫经线，一条条从北极连到南极，每条都一样长；横着的叫纬线，一圈套一圈，越靠两极越小。两套线各有一条“零号线”：横着的零号线是赤道，竖着的零号线是本初子午线（它穿过英国格林尼治）。有了零号线，才能量出“偏了多少度”。The up-and-down lines are meridians (longitude lines): each runs from pole to pole, and they are all the same length. The sideways lines are parallels (latitude lines): rings inside rings, shrinking toward the poles. Each set has a zero line — the Equator across the middle, and the Prime Meridian (it runs through Greenwich, England). Without a zero line there is nothing to measure “how far off” from.
那一个地方的地址，到底怎么写、怎么读？So how is one place's address actually written and read?
第 2 步：读懂一个坐标Step 2: Reading one coordinate
北京是 116°E, 40°N。40°N 是纬度：在赤道以北 40 度（N 北纬、S 南纬，最大 90 度，到极点）。116°E 是经度：在本初子午线以东 116 度（E 东经、W 西经，最大 180 度）。有时先写经度、有时先写纬度，认准字母就不会乱：N/S 跟着纬度，E/W 跟着经度。一条纬线加一条经线交叉，全地球只剩一个点。Beijing is 116°E, 40°N. The 40°N is latitude: 40 degrees north of the Equator (N north, S south, up to 90° at the poles). The 116°E is longitude: 116 degrees east of the Prime Meridian (E east, W west, up to 180°). Some maps write longitude first, some latitude first — the letters settle it: N/S always belongs to latitude, E/W to longitude. One parallel crossing one meridian leaves exactly one point on Earth.
手机地图上那个蓝点，也是这么算出来的吗？And the blue dot on your phone — is it worked out the same way?
第 3 步：手机里的经纬度Step 3: Latitude and longitude in your pocket
是的。卫星不停广播“我是谁、现在几点”，手机收到三四颗卫星的信号，用时间差算出到每颗卫星有多远，几个距离一交会，就锁定了你的经纬度。导航、送餐、海上救援报位置，用的都是这套地址。要更精细还能往下分：1 度 = 60 分，1 分 = 60 秒，救援常说的“北纬 22 度 30 分”就是这么来的。Yes. Satellites keep broadcasting “who I am and what time it is”; your phone picks up three or four of them, turns the tiny time gaps into distances, and where those distances cross is your latitude and longitude. Navigation, food delivery and sea rescue all speak this address. It can go finer too: 1 degree = 60 minutes, 1 minute = 60 seconds — which is why a rescue call sounds like “22 degrees 30 minutes north”.
规则就这么多。先在网格上滑一滑看读数，再按坐标点中那一格，把补给送到。That's the whole rule set. Slide across the grid to read the coordinates, then tap the square that matches — and the crate is delivered.
一句话记住它：经纬度是地球的门牌号——纬度定南北、经度定东西，两条线一交叉，全球只剩一个点。Remember it in one line: latitude and longitude are Earth's street address — latitude fixes north–south, longitude fixes east–west, and the two lines cross at exactly one point.
纬线横着一圈圈：纬度从赤道 0° 数到两极 90°，分北纬 N、南纬 SParallels run sideways: latitude counts 0° at the Equator up to 90° at the poles, N or S经线竖着连两极：经度从本初子午线 0° 数到 180°，分东经 E、西经 WMeridians run pole to pole: longitude counts 0° at the Prime Meridian up to 180°, E or W认准字母不会错：N/S 是纬度、E/W 是经度；1 度还能再分成 60 分、60 秒Trust the letters: N/S marks latitude, E/W marks longitude; 1 degree splits into 60 minutes and 60 seconds
内容参考 OpenStax 等公开教材，多来源核对 · AI 生成、人工审核 · 发现错误欢迎指正，帮这片叶子长得更好。Based on OpenStax and other open textbooks, cross-checked across sources · AI-generated, human-reviewed · Spotted a mistake? Tell us — help this leaf grow.
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