Metric Conversions Premium vs 逐星 Perseids

Premium version of the unit converter app from the most popular metric conversions website in the world, metric-conversions.org. Over a billion visitors have used our website, try our app and see why we're so popular! FEATURES: No advertisements, tracking or any of your user data used Easy to use clear interface Works offline All popular unit conversions (over 30,000 of them) Over 130 currencies (including Bitcoin) with exchange rates updated every hour Store your favorite conversions for quick access Answers in fractions where needed. Obtain conversion results with up to 5 decimal places Imperial units split into other imperial units – so you can get a weight in stones and pounds, pounds and ounces, etc. Lengths break down into feet and inches, etc. WEIGHT: Kilograms, Pounds, Stones, Ounces, Grams, Carats, Grains, Hundredweights, Microgram, Milligrams, Ounces, Pennyweights, Tons, Troy pounds, Troy ounces TEMPERATURE: Celsius, Fahrenheit, Kelvin, Rankine, Newton, Réaumur, Rømer, Delisle. LENGTH: Miles, Yards, Feet, Inches, Kilometers, Meters, Centimeters, Chains, Decimeters, Furlongs, Leagues, Lightyears, Microinches, Microns, Millimeters, Parsecs, Nautical Leagues, Nautical Miles. AREA: Square Miles, Acres, Square Yards, Square Feet, Square Inches, Square Kilometers, Hectares, Square Meters, Square Centimeters, Square Millimeters, Square Microns, Square Microinches. VOLUME: Cups, Tablespoons, Teaspoons, Gallons, Pints, Gills, Ounces , Cubic Meters, Liters, Centiliters, Milliliters, Cubic Yards, Barrels, Quarts, Gills. SPEED: Miles per hour, Kilometers per hour, Meters per second, Knots, Mach, Light speed and more. TIME: Seconds, Minutes, Hours, Days. ANGLE: Degrees, Radians, Minutes (Angular), Seconds (Angular), Centrad, Gradians, Milliradians, Sign PRESSURE: Atmospheres, Bar, Pascals, Pound Force per Square Inch, Inches of Mercury, Inches of Water, Kilogram Force per Square Meter, Millibar, Millimeters of Mercury, Millimeters of Water, Newtons per Meter Squared, Pounds per Square Foot, Torrs CURRENCY: All state sponsored world currencies as well as Bitcoin. If you need anything added, email us at appcontact@metric-conversions.org and we'll do our best to put them in for you!

逐星 Perseids 是一款面向 2026 英仙座流星雨的观测规划工具，帮助你从暗夜条件、云量、天气与出行安全等多个角度选择观测地点。 主要功能： • 全国暗夜地图：结合 World Atlas 2015 与 NASA Black Marble 2024 VIIRS 数据，直观查看光污染分布与估算波特尔等级。 • 262 个观测地点：离线收录全国候选地点，可按省级地区、暗夜条件和计划状态筛选。 • 云量图层：查看总云、低云、中云和高云预测，识别更适合观测的区域。 • 观测夜规划：在未来 15 日内切换观测夜，比较地点条件并管理观测计划。 • 地点详情：查看海拔、暗夜等级、天气、观测窗口、地点提示与进入风险。 • 安全出行：提供出发清单、坐标分享、预计安全到达时间和报平安提醒。 • 可选定位：仅在你主动操作时读取一次当前位置，用于寻找附近地点；拒绝定位仍可使用离线地点目录。 数据与安全说明： 光污染等级、云量和天气均为模型或预报结果，不代表现场实测，也不能替代天气预警、道路开放信息和个人安全判断。偏远地点可能存在极端天气、无通信、道路封闭等风险，请在出发前核实当地公告并做好返程与应急准备。