Yeoneul City Observatory

How it was made

The city observatory of Yeoneul, a fictional city. Its site is set on the west ridge of Yeoneulsan at 612m above sea level.

The home screen is a circular star chart with a time band from 18:00 to 05:00. Object information reads as almanac tables.

A single red (#FF6A5C) on a navy background (#0B1228). Typefaces are Pretendard and Red Hat Mono.

Positions of the sun, moon, planets and 89 stars are calculated in the browser. Pressing a time button turns the star chart to that time.

The observing index is derived from cloud, moon, transparency, seeing and sky brightness. The formula and inputs can be expanded on the home page.

The booking screen checks open seats, guardian ratio and age, and calculates the price. There is also a red screen toggle.

Key features

• Star chart by time · object selection
• 37-object guide · filters · drawer
• Session booking (open seat and guardian checks)
• Red screen toggle · notice filter

Where and how to use it

Fits public visitor facilities with sessions and capacity. Session table, open seats, price by headcount and booking checks form one flow.

Points to check

Weather values and the sky are fixed to the night of October 5. Star coordinates are approximate and bookings are not submitted.