ぐるぐる ZEISS IV型 vs Eclipse Simulator

「ぐるぐる ZEISS IV型」は、ドイツのカール・ツァイス社が製作した大型ドーム用光学式プラネタリウム「ツァイスⅣ(4)型」を手のひらで体験できるアプリです。 ---------------------- 光学式プラネタリウム ZEISS Mark IV 旧・西ドイツのカール・ツァイス社製の光学式プラネタリウム「ツァイスⅣ(4)型」です。市立名古屋科学館（現在の名古屋市科学館）が開館した1962年11月から2010年8月まで約48年にわたって活躍し、現在は名古屋市科学館の展示室で動態保存されています。 鉄あれい型の両端にある大きな球体が恒星投影機で、それぞれ北天と南天の恒星を投影します。間にあるカゴ状の部分は惑星棚と呼ばれ、惑星や太陽、月の投影機が収まっています。惑星等の投影機は歯車やリンク等によって向きを変える仕組みで、日々の位置変化を機械仕掛けで再現していました。また、投影機全体を回すことで、星空の日周運動や歳差運動、緯度の異なる場所での星空を再現することができました。

Eclipse Simulator is an educational and investigative tool for finding unusual solar and lunar eclipses by combining an observing location, horizon conditions, and long-term Earth-rotation variation (ΔT). Its search catalog spans astronomical year -999 (1000 BCE) through 5000 CE. Study each event through maps, a ground-level view, and contact times. Key features • Search solar and lunar eclipses by date range, eclipse type, location, and other available criteria. • Narrow the search with an observing location, solar horizon conditions near sunrise or sunset, lunar moonrise or moonset, and ΔT. • View solar-eclipse center and limit lines, partial-eclipse regions, and lunar-eclipse visibility on Apple Maps. • Choose an observing location and play the changing alignment of the Sun, Moon, and shadow from the ground. • Inspect the contact times that exist for the event, including C1–C4 for solar eclipses and P1–P4/U1–U4 for lunar eclipses. • Compare the standard ΔT model with alternative scenarios to understand how uncertainty affects historical and future timing and paths. • View stars and constellation lines adjusted to the selected event time instead of showing today’s sky. • Share the selected event as CSV or JSON and the displayed screen as PNG or PDF. On iPhone, the app uses focused screen-by-screen navigation. On iPad, its wider layout keeps the catalog and event workspace within easier reach. If you grant location access, it is used only to set the observing point to your current location. You can also select a point on the map or enter coordinates. About time and accuracy Results are modeled values derived from the ephemeris, ΔT model, and Earth-orientation model recorded with the bundled data. The broad search catalog includes a low-precision analytical ephemeris, while the calculation provenance for a selected event is shown in the app and exports. Uncertainty remains in ΔT, future civil-time rules, polar motion, lunar-limb terrain, local terrain, and weather. Historical and future views use present-day Apple Maps and do not reconstruct borders or cities from the selected era. Lunar-eclipse color is schematic. Use the app for education, understanding astronomical geometry, and comparing model assumptions. Do not rely on it as a guaranteed value for observation planning, navigation, scientific conclusions, or safety-critical decisions.