Amagi Highland in Japan — Starry Sky with a View of the Pacific Horizon at 1,000m

Overview

Amagi Highland is located in Izu City, Shizuoka Prefecture, in the Amagi mountain range that forms the backbone of the Izu Peninsula at approximately 1,000 meters elevation. With relatively good access from the Tokyo area, it combines the warm, temperate Pacific-side climate with favorable stargazing conditions.

The Amagi Pass hiking course starts here, offering hiking during the day and stargazing at night as dual attractions.

Observation Environment

Due to Izu Peninsula's geography, the southeastern direction faces the Pacific Ocean with no artificial light sources. With dark sea extending to the horizon, celestial objects at low positions in the southern sky are easier to observe.

Meanwhile, light pollution from the Mishima and Numazu areas slightly affects the northern to northwestern sky. The overall Bortle class rating is approximately 3, but the southern sky is significantly darker.

Winter is particularly favorable due to the Pacific side's characteristically high clear night rates, providing stable observing conditions even when the Japan Sea side is blanketed with snow clouds.

Recommended Observation Points

The Amagi Highland parking area (Amagi Traverse Course entrance) is the most accessible spot, featuring a paved, spacious parking area with good southern sky visibility.

Access

Approximately 60 minutes from Numazu IC on the Tomei Expressway or Nagaizumi Numazu IC on the Shin-Tomei via Izu Longitudinal Road and Izu Central Road. The winding mountain roads require careful nighttime driving.

Stargazing Tips

Though the Izu Peninsula is warm, the 1,000-meter highland drops below freezing in winter, requiring standard cold-weather precautions. Humid ocean air can cause sudden fog; be mindful of visibility changes. For photography, lens heaters prevent dew accumulation effectively.