This is the Saint Louis Science Center’s NIGHT SKY UPDATE for the week of Tuesday, October 30. Times are given as local St. Louis time in Central Daylight Time (Oct 30 – Nov 3) and Central Standard Time (Nov 4 – Nov 7) due to the time change coming this Sunday. For definitions of terminology used in the night sky update, click the highlighted text.ghted text.

Information updated weekly or as needed.

Join us for our next star party, Friday, November 2, 2018 held in association with the St. Louis Astronomical Society. For details, see the information at the bottom of this page.

The Sun and Moon

Sunrise is at 7:26 a.m. on Tuesday, October 30 and sunset is at 6:03 p.m. providing us with about 10.5 hours of daylight. Even after sunset, the light from the sun will still dimly illuminate our sky for about 1.5 hours. This period is called twilight, which ends around 7:32 p.m. this week. For those with a sun dial, solar transit or local noon occurs around 12:45 p.m. this week.

Daylight Saving Time ends on Sunday, November 4. Remember to set you clocks one hour back before you go to bed on Saturday.




30 Oct

7:26 a.m.

6:03 p.m.

31 Oct

7:27 a.m.

6:02 p.m.

01 Nov

7:28 a.m.

6:01 p.m.

02 Nov

7:29 a.m.

6:00 p.m.

03 Nov

7:30 a.m.

5:59 p.m.

04 Nov

6:31 a.m.

4:58 p.m.

05 Nov

6:32 a.m.

4:57 p.m.

06 Nov

6:33 a.m.

4:56 p.m.

07 Nov

6:34 a.m.

4:55 p.m.

Moonrise lfor Tuesday, October 30 occurs at 11:30 p.m. and moonset will occur at 2:12 p.m. on the following day. On Tuesday, October 30 the moon will be exhibiting a waning gibbous phase with roughly 61% of the lunar disk illuminated. Last quarter moon occurs on October 31.

International Space Station (ISS) Observing

Visible passes of ISS from St. Louis for the week of October 30 occur during morning hours. The best of these occurs on the morning of November 1. Use the table below for information about this and other visible passes of ISS.

Catch ISS from St. Louis starting Tuesday, October 30



Max. altitude


Time Alt. Az. Time Alt. Az. Time Alt. Az.

31 Oct

-1.0 05:11:43 16 NE 05:11:43 16 NE 05:12:30 10 NE

31 Oct

-1.7 06:44:25 10 NW 06:46:14 14 NNW 06:48:06 10 NNE

01 Nov

-1.8 05:54:47 18 N 05:54:47 18 N 05:56:29 10 NNE

Magnitude (Mag): The Measure of brightness for a celestial object. The lower the value is, the brighter the object will be.

Altitude (Alt): The angle of a celestial object measured upwards from the observer’s horizon.

Azimuth (Az): The direction of a celestial object, measured clockwise from an observer’s location with north being 0°, east being 90°, south being 180° and west being 270°.

For information about ISS flyovers and other visible satellites, visit

Detailed information regarding all unmanned exploration of our universe, missions past, present, and planned, can be found at Jet Propulsion Laboratories:

The Planets Visible Without a Telescope

This week two of the naked eye planets are visible, Saturn is in the southwest after sunset and Mars will be seen shortly after sunset in the south.


The red planet can be found in the south as the sun sets. With opposition having come and gone the bright appearance of Mars will begin to fade. Mars will set by 1:02 a.m.


Saturn has been visible in the southern sky for some time, but the angle of the summertime ecliptic has kept the ringed planet low in the southern sky. Saturn has now shifted to the southwestern sky and will only be visible for a few hours after sunset. Saturn sets at 9:25 p.m.

Our next Star Party will be held on Friday, November 2, 2018, from dusk until 10 p.m.

As part of the Saint Louis Science Center’s First Fridays, weather permitting, the St. Louis Astronomical Society and the Science Center will set up a number of telescopes outdoors and be on-hand to answer your questions. Telescope viewing begins once it is dark. Regardless of the weather on November 2, join us indoors in our planetarium theater for “The Sky Tonight”. Showtime is at 7 p.m.

This free, indoor star program will introduce you to the current night sky, the planets, and the seasonal constellations. Doors open 15 minutes before show time. Shows begins at 7 p.m. Sorry, no late admissions due to safety issues in the darkened theater.

The St. Louis Astronomical Society helps host the monthly Star Parties at the Saint Louis Science Center which are held on the first Friday of each month. Our Monthly Star Parties are open to the public and free of charge. Telescope viewing is scheduled to start around 7:00 p.m. however with the change to day light saving time, darkness starts closer to 8:00 p.m.