iiinova — where your digital self keeps evolving

Olivia Vane

@oliviafvane.bsky.social

3.9K followers 196 following 9 posts

Data visualisation design + code Interactive data journalist at The Economist oliviavane.co.uk

Olivia Vane @oliviafvane.bsky.social · 12/05/2025

In Morocco the interplay between Ramadan, which moves with the lunar calendar, and daylight saving left the government changing clocks up to 4 times a year. Shifting daylight saving to avoid Ramadan helps Muslims observing the holy month, so they don’t have to delay breaking their fast.

A heatmap titled "Sunrise time in Morocco" shows the shift in sunrise times from 2007 to 2024 across each month (January to December). Colours range from light (earlier sunrise) to dark blue (later sunrise). Each row represents a different year, with daylight saving time and Ramadan periods marked.

From 2008 onwards, daylight saving is observed in morocco, but it's start and end dates move to avoid Ramadan. In 2018, Morocco moves to permanent daylight saving, except during Ramadan.

122

Olivia Vane @oliviafvane.bsky.social · 12/05/2025

But far from extreme latitudes, some places still shade blue. In far-western China, the sun doesn't rise until after 10am in early Jan. These are places where the clock runs far behind solar time—a place's natural time, where the clock would show noon when the sun is at its zenith.

Globe map centred on China showing the hour of sunrise in local time in January. The colour gradient stretches from blue (corresponding to a late sunrise, ~10am) in western China, to red (corresponding to an earlier sunrise, ~7am) in Eastern China.

171

Olivia Vane @oliviafvane.bsky.social · 12/05/2025

That pale disc bouncing between the poles is polar day, where the sun never sets. The shadow sweeping in and out at the opposite pole is polar night, where the sun never rises. The Arctic Circle is defined by this phenomenon. It is the area where the sun won’t rise for at least 1 day a year.

152

Olivia Vane @oliviafvane.bsky.social · 12/05/2025

This map shows the hour of sunrise globally through the year. It reveals time zones following national and, sometimes, regional boundaries, and slicing through the oceans.

34013