Astronomical Diary
MOON PHASES
fullmoonjpg lastquarterjpg newmoonjpg firstquarter.jpg
Full Moon Last Quarter New Moon First Quarter
Aug 3
11:59 PM
Aug 12
12:45 AM
Aug 19
10:42 AM
Aug 26
1:58 AM
SPACE WEATHER
Current Condition X-ray Solar Flares
SOLAR WIND

Speed: 338.2 km/sec
Density: 5.9 protons/cm3
More Data: ACE, DSCOVR

Explanation | More Data
Updated: Aug 1 at 0720 UT

***Sunspots AR2767 and AR2768 are both members of Solar Cycle 25.
We know this because of their magnetic polarity,
which is reversed compared to sunspots from old Solar Cycle 24.

Credit: Solar Dynamics Observatory(SDO)/Helioseismic
and Magnetic Imager (HMI).
Daily Sun: 1 August 2020
DSun
6-hr max: A8 0609 UT Aug01
24-hr: A8 1312 UT July31
Explanation | More Data
Updated: Aug 01 at 0725 UT
Time (PST) of rise and set of some planets at 10-day interval
DATE MERCURY VENUS MARS JUPITER SATURN
Rise Set Rise Set Rise Set Rise Set Rise Set
Aug 8 4:56 AM 5:47 PM 2:26 AM 3:14 PM 10:04 PM *10:19 AM 4:33 PM *3:51 AM 5:05 PM *4:26 AM
Aug 18 5:46 AM 6:23 PM 2:26 AM 3:15 PM 9:36 PM *9:54 AM 3:50 PM *3:08 AM 4:23 PM *3:44 AM
Aug 28 6:26 AM 6:47 PM 2:31 AM 3:19 PM 9:05 PM *9:25 AM 3:08 PM *2:25 AM 3:42 PM *3:03 AM

* = Following day
Astronomical Events August 2020

Meteor Shower

August is one of the most popular times of the year to observe meteor showers. If the sky permits, the famous Perseids meteor shower will be observed with its peak in the late evening and early morning hours on August 12-13 with at least 50 or more meteors observed during peak time. Unfortunately, the waxing gibbous Moon may interfere with the observations of fainter meteors.

Meteors are easiest to observe if there is no moonlight, light pollution, and a clear sky. The Perseids meteor shower radiates out from the constellation Perseus, which is located on the eastern horizon during August as shown in Figures 3 & 3a.

Figure 3
Figure 3
Figure 3a
Figure 3a
Stars and Constellations

Well-known constellations such as Leo, Ursa Major, Virgo, Libra, Scorpius and Sagittarius are most prominent during the month. The constellation of Leo, the Lion can be observed at about 20 degrees from the northwestern horizon after sunset. In this constellation, an asterism known as the inverted Question Mark, or sometimes known as the scythe, can be figured out, that represents the head of a lion. Looking towards the northern direction, the constellations of Ursa Major, the Great Polar Bear, and Ursa Minor, the Small Bear, can be located. Another famous asterism can be found along the constellation of Ursa Major, is the well-known Big Dipper, sometimes called the ladle or the plough as shown in Figures 1 & 1a. Navigators at night utilize the Big Dipper to locate the North Star (Polaris). By extending an imaginary line from the two stars Merak to Dubhe, which are located on the tip of the ladle and then measuring five times of their distance will point the position of the North Star.

Figure 1
Figure 1
Figure 1a
Figure 1a



Facing south, zodiac constellations can be found as shown in Figures 2 & 2a. The constellation of Virgo, the Virgin is well placed high on the southwestern horizon. The constellations of Libra, the Scale; Scorpius, the Scorpion; and Sagittarius, the Archer; follow Virgo on the southeastern horizon, respectively.

Figure 2
Figure 2
Figure 2a
Figure 2a

Planets Whereabout

The Planet whereabouts…
On August 1 at 3:30 A.M., as shown in Figures 4 & 4a, six planets line-up in the sky. From the eastern horizon towards the western horizon, Venus ,Uranus, Mars, Neptune, Saturn and Jupiter will be observed lying among the background stars of the constellation Taurus, Aries, Pisces, Aquarius and Sagittarius. They will be having magnitudes of -4.50, +5.7, -1.08, +7.8, +0.15 and -2.70 respectively.

Uranus may be observed by the naked eyes under a very good clear and dark sky condition, while Neptune requires a telescope. Familiarity with a starmap, the position of the planet to its surrounding stars may be of great help in locating this planet. It is better to use a computer generated free downloadable astronomical application such as Stellarium for laptops and desktops and Sky Tracker for android phones to be able to locate easily and identify these celestial bodies in the sky.

Mercury will difficult to observe due to its proximity to the Sun during the month.

Figure 4
Figure 4
Figure 4a
Figure 4a


Figure 5 shows how to compare apparent magnitudes of celestial bodies such as planets and stars

Figure 5 Apparent Magnitude of Celestial Bodies
Figure 5

AUGUST 2020
DATE EVENT TIME (PhST)
2 Saturn 2.4° south of the Moon 9:00 PM
9 Moon at apogee (farthest distance to Earth = 404,700 km) 9:50 PM
13 Venus elongation 45.8° W 9:00 AM
15 Venus 4.2° N of Moon 9:00 PM
17 Pollux 4.6° south of the Moon 3:00 AM
17 Mercury superior conjunction 11:00 PM
21 Moon at perigee (nearest distance to Earth = 363,500 km) 6:57 PM
30 Saturn 2.3° south of the Moon 1:00 AM

ERRATA FOR THE ALMANAC FOR GEODETIC ENGINEERS 2020


Regarding the publication on page 2 of the ALMANAC FOR GEODETIC ENGINEERS 2020, which contains the data for the EPHEMERIS OF THE SUN, it was verified that the February 29, 2020 date is missing but the data for the particular date is the data printed as March 1, 2020. The data printed from April 3 to December 31 are all correct.

Kindly refer to the image/link below for the data errata on the Ephemeris of the Sun 2020.
Errata2020
Errata of AGE 2020, page 2
(Errata of AGE 2020 pdf file)