[{"data":1,"prerenderedAt":31},["ShallowReactive",2],{"$f3fn35pdtsbw47":3},{"slug":4,"title":5,"description":6,"date":7,"product":8,"url":9,"minutes":10,"html":11,"next":12},"sun-glare-on-indian-highways","Sun in your eyes while driving: which Indian highways get it, and when","Sun glare while driving is predictable from the road's direction, the time and the season. Which Indian highways get it, when, and how to avoid it.","2026-10-21","Glare Map","https:\u002F\u002Fglare-map.tukka.dev",3,"\u003Cp>If the sun hits you in the face on the same drive home every winter afternoon, you can predict it. Sun glare while driving comes down to three things you can work out in advance: which way the road runs, the time of day and the time of year.\u003C\u002Fp>\n\u003Cp>I made a free map, \u003Ca href=\"https:\u002F\u002Fglare-map.tukka.dev\">Glare Map\u003C\u002Fa>, that works this out for every national highway in India, for any date and time.\u003C\u002Fp>\n\u003Ch2>When the sun counts as in your eyes\u003C\u002Fh2>\n\u003Cp>The sun has to be low and close to straight ahead. Glare research puts the start of disabling glare at 19 to 25° from your line of sight, and a \u003Ca href=\"https:\u002F\u002Fbmjopen.bmj.com\u002Fcontent\u002F9\u002F8\u002Fe028350\">nationwide study of crashes in Japan\u003C\u002Fa> counted sun glare out to 45°. Once the sun is more than about 25° above the horizon, the car's roof and the sun visor block it.\u003C\u002Fp>\n\u003Cp>So glare comes in the hour or two after sunrise and before sunset, and only on roads that point roughly at the sun.\u003C\u002Fp>\n\u003Ch2>Why westbound roads are worst in winter\u003C\u002Fh2>\n\u003Cp>On 21 December the sun sets a little south of west, at a bearing of about 244° whether you're in Jorhat, Delhi or Mumbai. On 21 June it sets a little north of west, at about 297°.\u003C\u002Fp>\n\u003Cp>A road running west-southwest therefore catches the low afternoon sun from October to February, and a road running west-northwest catches it in summer. A road running north to south almost never does: even in June, when the sun rises and sets furthest north, it's more than 60° off a northbound driver's line of sight when it's low.\u003C\u002Fp>\n\u003Cp>Mornings mirror this. Roads running east-southeast get the winter sunrise, and roads running east-northeast get the summer one.\u003C\u002Fp>\n\u003Ch2>The east gets it earlier\u003C\u002Fh2>\n\u003Cp>All of India keeps one clock, so in the east the sun sets much earlier by it. On 21 December it sets at about 4:25 PM in Jorhat, 4:57 PM in Kolkata, 5:29 PM in Delhi and 6:06 PM in Mumbai. In Assam the low winter sun lands in the middle of the afternoon drive home.\u003C\u002Fp>\n\u003Ch2>An example: Sivasagar to Jorhat\u003C\u002Fh2>\n\u003Cp>This is the drive that started Glare Map. The 57 km on NH 2 and NH 715 head west-southwest, at about 238° overall. On 21 December at 3:30 PM the sun is 10° up at a bearing of 237°, dead ahead.\u003C\u002Fp>\n\u003Cp>On the 15th of each month, the sun is in your eyes on this road at about these times:\u003C\u002Fp>\n\u003Col>\n\u003Cli>October: 2:50 to 4:45 PM\u003C\u002Fli>\n\u003Cli>November: 2:15 to 4:20 PM\u003C\u002Fli>\n\u003Cli>December: 2:20 to 4:20 PM\u003C\u002Fli>\n\u003Cli>January: 2:35 to 4:40 PM\u003C\u002Fli>\n\u003Cli>February: 3:00 to 5:05 PM\u003C\u002Fli>\n\u003C\u002Fol>\n\u003Cp>From March to September the sun sets further north, off to the right, and the drive is mostly clear. The drive back to Sivasagar gets the sun at dawn instead, from April to August, at about 4:30 to 6:00 AM.\u003C\u002Fp>\n\u003Cp>On 17 October, leaving Sivasagar at 3:00 PM means about 41 of the 69 minutes with the sun in your eyes. Leaving by 1:30 PM, or after 4:45 PM, avoids it.\u003C\u002Fp>\n\u003Ch2>Check your own road\u003C\u002Fh2>\n\u003Cp>On \u003Ca href=\"https:\u002F\u002Fglare-map.tukka.dev\">Glare Map\u003C\u002Fa>:\u003C\u002Fp>\n\u003Col>\n\u003Cli>Pick your state at the top left. The map opens on it with every national highway.\u003C\u002Fli>\n\u003Cli>Move the time slider. A road turns red where the low sun is straight ahead, with arrows pointing the way that gets it, and orange where it's close.\u003C\u002Fli>\n\u003Cli>Tap a road to see its whole year for both directions, months against hours, with the glare shaded.\u003C\u002Fli>\n\u003Cli>Open Trip and pick two towns. A strip shows how many minutes of glare each departure time gets through the day, and the panel says which side of the bus or car the sun is on, so passengers can sit in the shade.\u003C\u002Fli>\n\u003C\u002Fol>\n\u003Cp>Everything is worked out in your browser, and the towns you pick aren't sent anywhere.\u003C\u002Fp>\n\u003Ch2>If you can't avoid it\u003C\u002Fh2>\n\u003Col>\n\u003Cli>Keep the windscreen clean inside and out, since smears scatter the light.\u003C\u002Fli>\n\u003Cli>Use the visor and wear sunglasses; polarised lenses cut the glare off the road.\u003C\u002Fli>\n\u003Cli>Slow down and leave more room. The drivers ahead may be blinded too, and so may people crossing.\u003C\u002Fli>\n\u003Cli>With the sun behind you, drivers coming the other way can't see you well, so switch on your headlights.\u003C\u002Fli>\n\u003C\u002Fol>\n\u003Cp>The map assumes an open horizon. Hills, trees and buildings often hide a low sun, so on a winding hill road the real glare is usually less than it shows.\u003C\u002Fp>\n",[13,19,25],{"slug":14,"title":15,"description":16,"date":7,"product":17,"url":18,"minutes":10},"talk-to-a-3d-anime-girl","Talk to a 3D anime girl in your browser with your own OpenAI key","Yume is a free 3D anime companion that runs in your browser. Pick a girl, turn the view right around her, and talk to her out loud with your own OpenAI or OpenRouter key.","Yume","https:\u002F\u002Fyume.tukka.dev",{"slug":20,"title":21,"description":22,"date":7,"product":23,"url":24,"minutes":10},"hardest-countries-to-find-on-a-blank-map","The hardest countries to find on a blank world map","On a laptop-wide world map, Rwanda covers about 30 square pixels. Why small countries are so hard to find, and the neighbours that lead you to them.","Map Blitz","https:\u002F\u002Fmap-blitz.tukka.dev",{"slug":26,"title":27,"description":28,"date":7,"product":29,"url":30,"minutes":10},"walk-among-dinosaurs-in-3d","Walk among dinosaurs and woolly mammoths in 3D, in your browser","A free 3D walk through early Earth's lava fields, the Jurassic, the Late Cretaceous and the Ice Age, among dinosaurs and woolly mammoths, in your browser.","Prehistoric Walk","https:\u002F\u002Fprehistoric-walk.tukka.dev",1792561478539]