Ephemeris Computation Office, NAOJ
https://eco.mtk.nao.ac.jp/koyomi/index.html.en
2024-02-01T05:00:00+09:00This site offers lots of information on calendar and ephemeris, such as times of rising, meridian transit, settig of the Sun, Moon or planets, solar eclipse, lunar eclipse, transit of planet, and lunar occultation.Ephemeris Computation Office, NAOJ
https://eco.mtk.nao.ac.jp/koyomi/index.html.en
https://eco.mtk.nao.ac.jp/apple-touch-icon-72x72-precomposed.pngReleased Reki Yoko 2025.
https://eco.mtk.nao.ac.jp/koyomi/yoko/index.html.en
2024-02-01T05:00:00+09:00
Summaries for <em>Reki Yoko</em> 2025 are as follows. All date and time are based on <a href="https://eco.mtk.nao.ac.jp/koyomi/faq/time.html.en" >JCST</a> (UTC + 9<sup>h</sup>).
<dl>
<dt>Equinoxes in 2025 will be on March 20th and September 23rd.</dt>
<dt><a href="https://eco.mtk.nao.ac.jp/koyomi/faq/24sekki.html.en#Setsubun" ><em>Setsubun</em></a> will be <a href="https://eco.mtk.nao.ac.jp/koyomi/topics/html/topics2021_2.html" >on February 2nd</a>.</dt>
<dt>There are 2 <a href="https://eco.mtk.nao.ac.jp/koyomi/faq/solar_eclipse.html.en" >solar eclipses</a> and 2 <a href="https://eco.mtk.nao.ac.jp/koyomi/faq/lunar_eclipse.html.en" >lunar eclipses</a> in 2025.</dt>
<dd>There is a total lunar eclipse on March 14th. In general, the barely eclipsed Moon rises at Hokkaido, most part of Tohoku region, eastern part of Kanto region, and Ogasawara Islands.</dd>
<dd>There is a partial solar eclipse on March 29th. It is not visible from Japan.</dd>
<dd>There is a total lunar eclipse on September 8th. Total eclipse is visible from all over Japan.</dd>
<dd>There is a partial solar eclipse on September 22nd. It is not visible from Japan.</dd>
<dd>Please check <a href="https://eco.mtk.nao.ac.jp/koyomi/yoko/index.html.en" ><em>Reki Yoko</em></a> or Local Prediction of <a href="https://eco.mtk.nao.ac.jp/cgi-bin/koyomi/eclipsex_s_en.cgi" >Solar Eclipse</a> or <a href="https://eco.mtk.nao.ac.jp/cgi-bin/koyomi/eclipsex_l_en.cgi" >Lunar Eclipse</a> for more information.</dd>
<dt><a href="https://eco.mtk.nao.ac.jp/koyomi/yoko/archives.html.en" >List of <em>Reki Yoko</em></a></dt>
<dd>PDF versions of all <em>Reki Yoko</em> are available.</dd>
<dt><a href="https://eco.mtk.nao.ac.jp/koyomi/dni/index.html.en" >Local Calendar</a></dt>
<dd>Added calendar for 2025.</dd>
<dt><a href="https://eco.mtk.nao.ac.jp/koyomi/cande/cal/index.html.en" >Yearly Calendar</a></dt>
<dd>Added calendar for 2025.</dd>
<dt><a href="https://eco.mtk.nao.ac.jp/cgi-bin/koyomi/monthly_pc_en.cgi" >Monthly Calendar</a></dt>
<dd>Added data for 2025.</dd>
<dt><a href="https://eco.mtk.nao.ac.jp/koyomi/cande/index.html.en" >Calendar and Ephemeris Web Version</a></dt>
<dd>Added data for 2025.</dd>
</dl>
Partial Lunar Eclipse on early morning of Oct. 29th
https://eco.mtk.nao.ac.jp/cgi-bin/koyomi/eclipsex_l_en.cgi
2023-10-27T18:00:00+09:00
<div><img src="https://eco.mtk.nao.ac.jp/koyomi/koyomix/leclfig/koyomix/fig20232_en.png" alt="map" width="170" height="140" /></div>
<ul>
<li><a href="https://eco.mtk.nao.ac.jp/cgi-bin/koyomi/eclipsex_l_en.cgi" >Local Prediction</a></li>
<li>Tiny lunar eclipse at just before moonset and just before sunrise. Watch the Moon at places where you can see the low west horizon.</li>
<li>Local Prediction for <a href="https://eco.mtk.nao.ac.jp/cgi-bin/koyomi/gpsform_lecl_en.cgi" >Mobile (SSL)</a> or <a href="http://eco.mtk.nao.ac.jp/cgi-bin/koyomi/gpsform_lecl_en.cgi" >Mobile (non-SSL)</a></li>
</ul>
Annular-Total Solar Eclipse on April 20th
https://eco.mtk.nao.ac.jp/cgi-bin/koyomi/eclipsex_s_en.cgi
2023-03-28T12:00:00+09:00
<div><a href="https://eco.mtk.nao.ac.jp/koyomi/koyomix/image/seclmap_shdw20231.gif" ><img src="https://eco.mtk.nao.ac.jp/koyomi/koyomix/image/seclmap_shdw20231.gif" alt="map" width="170" height="140" /></a></div>
<ul>
<li>Though maximum magnitude of eclipse is very small, partial solar eclipse is visible around 14:00 from the areas south of the red line. Caution! When you observe solar eclipse, you MUST NOT directly look at the sun. Otherwise, you might lose your eyesight.</li>
<li><a href="https://eco.mtk.nao.ac.jp/cgi-bin/koyomi/eclipsex_s_en.cgi" >Local Prediction of Solar Eclipse</a></li>
<li>Local Prediction for <a href="https://eco.mtk.nao.ac.jp/cgi-bin/koyomi/gpsform_secl_en.cgi" >Mobile (SSL)</a> or <a href="http://eco.mtk.nao.ac.jp/cgi-bin/koyomi/gpsform_secl_en.cgi" >Mobile (non-SSL)</a></li>
</ul>
Lunar Occultation of Venus on March 24th
https://eco.mtk.nao.ac.jp/cgi-bin/koyomi/occulx_p_en.cgi
2023-03-14T18:00:00+09:00
<div><a href="https://eco.mtk.nao.ac.jp/koyomi/koyomix/image/poclmap_shdw202302.gif" ><img src="https://eco.mtk.nao.ac.jp/koyomi/koyomix/image/poclmap_shdw202302.gif" alt="map" width="170" height="140" /></a></div>
<ul>
<li>Lunar Occultation of Venus is visible from the areas surrounded by red lines. Since the altitude of Venus is very low, you should search for places where you can see the lower west sky. In other areas, you can enjoy Venus and Moon coming so close together.</li>
<li><a href="https://eco.mtk.nao.ac.jp/cgi-bin/koyomi/occulx_p_en.cgi" >Local Prediction of Lunar Occultation of Planet</a>: Please select "2023-03-24 Venus" from the list.</li>
<li>Local Prediction for <a href="https://eco.mtk.nao.ac.jp/cgi-bin/koyomi/gpsform_pocl_en.cgi" >Mobile (SSL)</a> or <a href="http://eco.mtk.nao.ac.jp/cgi-bin/koyomi/gpsform_pocl_en.cgi" >Mobile (non-SSL)</a></li>
</ul>