The hoyoopin blog

Nine remote-work cities compared on comfortable months, rain and sunshine, using one simple rule and 1991–2020 climate averages you can check.

Where Celsius and Fahrenheit came from, which countries still use °F, the exact conversion formulas, and how far off the 'double it and add 30' shortcut is.

Turn monthly climate averages into a packing list: a kit table by temperature, wet and dry seasons in the tropics, and a Seoul–Bangkok worked example.

Heat exhaustion vs heat stroke and what to do for each, current NWS heat index bands, safe hydration limits, hot-car facts and a heatwave checklist.

The world's main monsoons and their normal onset dates, the wettest places on Earth, and month-by-month rainfall for Mumbai, Bangkok, Kuala Lumpur and more.

How the US AQI works after the 2024 PM2.5 update, what readings of 75 and 100 mean, how UK, EU, India and China scales differ, and when a mask helps.

How the NWS heat index turns temperature and humidity into a feels-like number, the current risk categories, a worked example, and what the index leaves out.

Why forecasts lose skill after a week: Lorenz's chaos experiment, how errors grow, ensembles, NOAA's accuracy figures and the two-week limit, with charts.

Earth's official weather records from the WMO archive: hottest, coldest, wettest, strongest gust and heaviest hail, plus the disputed Death Valley 1913 reading.

GMT is a time zone, UTC is the atomic standard behind every clock. How they differ, why London leaves GMT in summer, and how the world's 37 UTC offsets work.

Flight plans, slots and weather forecasts run on UTC; tickets and curfews use local time. How airlines keep both straight, with a London–New York example.

Why UTC added 27 leap seconds to track Earth's uneven spin, how the 2012 leap second broke servers, how smearing works, and why they end in May 2027.

How to set SLA targets a follow-the-sun support team can meet: real UTC shift maps for New York, London and Manila, daylight saving gaps, and an example.

Every half- and quarter-hour time zone in use in 2026, why India (UTC+5:30), Nepal (UTC+5:45) and Iran (UTC+3:30) chose them, and how to convert correctly.

France uses 12 time zones in winter and 13 in summer, from Tahiti (UTC−10) to Wallis and Futuna (UTC+12). The full verified list, with Paris time conversions.

Why the date changes in the Pacific, how Kiribati and Samoa moved the line, and how to work out your arrival date when you fly across it, with examples.

What social jetlag is, how to calculate it from a sleep log, what research links it to, and why the western edge of a time zone and DST can make it worse.

Antarctic stations keep their supply base's clock, and the ISS runs on UTC. Station-by-station IANA zones, Vostok's 2023 change and Troll's 2-hour jump.

timeanddate.com, World Time Buddy, Every Time Zone, phone and Windows clocks, and our own World Clock compared on price, cities, planning and sharing.

Dubai stays on UTC+4 all year. See when its time gap with London, New York and Sydney changes each year, and which countries have dropped DST.

Four policies for distributed teams: core hours per pair, a fair meeting rotation, async handoffs and DST planning, worked for San Francisco, Berlin and Sydney.

Shared working hours for real city sets in January and July, the DST shoulder weeks that shift them, and a checklist for invites across time zones.

The UN's 17 non-self-governing territories, how Greenland, Hong Kong, Åland and Puerto Rico are run, and what Gibraltar's 2026 treaty with the EU changed.

How ccTLDs like .de, .uk and .ai work: the ISO link and its exceptions, IANA and PTI, registration rules by country, IDN domains and the .ai and .tv windfalls.

Enclave vs exclave vs pene-exclave, Baarle-Hertog's 22 Belgian enclaves, the 2015 India–Bangladesh swap, Kaliningrad, Nakhchivan and three enclaved countries.

Why Pakistan has 241.49M in its 2023 census but 247.5M in UN data: census counts, UN WPP 2024 estimates, de jure vs de facto, and old censuses.

How E.164 phone numbers work: 1–3 digit country codes, nine numbering zones, shared +1 and +7, exit codes like 011 and 0011, and the Italian zero rule.

How ISO 4217 currency codes work: letter and numeric codes, X codes, minor units from 0 to 4 decimals, and changes like Bulgaria's euro and Zimbabwe's ZiG.

How ISO 3166 country codes work: 249 alpha-2, alpha-3 and numeric codes, where the numbers come from, which codes changed, and why Kosovo uses XK.

Territorial sea, contiguous zone, EEZ and continental shelf: widths in nm and km, what each zone allows, the 10 largest EEZs, and why the US is not a party.

The top 10 languages by total speakers per Ethnologue 2026, with native and second-language figures, and why Hindi–Urdu and Arabic counting changes the order.

South Sudan, Kosovo, Montenegro, Timor-Leste and more: independence dates, referendum results, UN admission dates and how Kosovo's recognition is counted.

Bolivia has 37 official languages, Zimbabwe 16, South Africa 12. How India, Switzerland and the US (Executive Order 14224, 2025) define official status.

The ten smallest countries by area, from Vatican City (0.49 km²) to Malta (316 km²), with UN population, density and why sources disagree.

How UN M49 groups 248 countries or areas into 5 regions and 17 sub-regions, with the codes, surprising placements and how hoyoopin's six continents compare.

Bolivia, South Africa, the Netherlands and others split their capital; Abuja, Astana and Naypyidaw replaced old ones. Dated guide, as of October 2026.