Tentai Sky Tonight Japan
A night-sky companion for Japan that goes beyond ISS to identify planets, meteor showers, and rocket launches visible from the user's prefecture each week.
Japanese amateur astronomers and parents introducing kids to the night sky
- Tonight's-sky dashboard with visible planets, ISS passes, and meteor shower peaks ranked by viewing quality
- Prefecture-by-prefecture cloud-cover forecast for the next 3 nights
- Launch tracker for Japanese rockets (H-IIA, H3, Space One) with viewing maps
- Educational 'sky-journal' so kids can log what they spotted each night
The trending article is the hook, but it also notes weather variability across Japan — there's a clear need for a location-aware companion, not a generic English app.
ISS interest confirmed (NASA Spot the Station localized for JP, JAXA's 'きぼうを見よう' site) and stargazing tourism exists in places like Achi Village and Hida, but dedicated Japanese night-sky app search volume appears modest and hobbyists currently rely on free global apps like Stellarium.Spot the Station - Google Play のアプリ ↗#きぼうを見よう - 国際宇宙ステーションが見える予測日時をお知らせ ↗
No clear Japan-specific competitor combining ISS + planets + meteor showers + Japanese rocket launches (JAXA H3/Epsilon, SpaceX from Tanegashima) with prefecture-aware weather; JAXA's Kibo site and NASA's Spot the Station are ISS-only, and global apps (Sky Tonight, Star Walk 2, Stellarium) aren't Japan-tailored.「きぼう」を見よう - JAXA ↗
Competing star apps use freemium (Sky Tonight free base) or low one-time price (Star Walk 2 ~$2.99), and NASA's Spot the Station is free; Japanese hobbyists have strong free alternatives for the ISS hook, making premium pricing difficult for a niche audience.Star Walk 2 vs Sky Tonight | What Is The Best Stargazing App ↗Best Stargazing Apps For iPhone And Android (Free And Paid) ↗
Astronomy as a hobby is enduring and Japan has an active launch cadence (JAXA, commercial providers visible from Tanegashima), but the ISS component has a defined end-of-life (~2030), so the value proposition must lean on planets/meteor showers/launches long-term.「きぼう」を見よう - 国際宇宙ステーションが見える予測日時をお知らせ ↗
Buildable with off-the-shelf satellite tracking (satellite.js), public ephemeris data for planets/meteors, JAXA/launch manifests, and standard weather APIs; main effort is curating Japan-specific content and Japanese UX, not novel astronomy tech.Stargazing App Market Evolution: Trends & 2033 Projections ↗