Lunar crescent visibility of Rabi’s al-awwal 1441 Hijri

The Conjonction :

The geocentric conjunction between the Moon and the Sun will be at the end of the lunar month on Monday, October 28 at 04:38 local time.

Moon’s position after sunset on Monday, October 28, 2019.

In Tunisia: After sunset, the moon will remain above the horizon from 33 to 34 minutes, All over the Tunisian territory. The geocentric elongation (ARCL) between the moon and the sun will be around 6° and the Moon’s elevation (HL) will be around 8.2°, after sunset. The highest values will be recorded in Borj El Khadra with HL= 6.2 ° and ARCL = 8.5 °.

In Islamic cities: The moon remain above the horizon after sunset on Tuesday, November 26, 2019, and the highest values of elongation and moon’s elevation, will be recorded in the western countries of the Islamic world. In Dakar, the Moon will remain above the horizon the maximum duration (around 36 minutes), after sunset, with HL = 7.6 ° and ARCL = 9.5 ° at sunset.

Possibility of Moon crescent visibility.

The visibility of the Rabi’s al-Thani crescent will be possible after sunset on Monday, October 28, 2019 in the world, from 16:26 local time. The crescent will be visible for the first time, from Turkey and central East of Africa, then successively to the West, as shown on the map below (Fig. 2).

Table 1: Astronomical data relating to the observation of the lunar crescent of Rabi al-Awwal 1441 Hijri, after sunset on Monday , October 28, 2019 - 29 Safar 1441 Hijri:

City Time Zones Sunset Lag Moon position at. Sunset
Moon Age HL DAZ ARCL W
HH HH Mn HH Mn HH Mn deg° deg° deg° %
Tunis 1.0 17 26 0 34 12 48 5.74 -3.82 8.47 0.55
Dakar 0. 18 43 0 36 15 4 7.66 -1.32 9.57 0.70
Nouakchott 0. 18 33 0 36 14 54 7.48 -1.89 9.49 0.69
Casablanca 0. 17 43 0 35 14 4 6.36 -3.95 9.08 0.63
Alger 1. 17 56 0 34 13 17 5.87 -406 8.70 0.58
Tripoli 1. 17 20 0 33 12 42 5.96 -3.22 8.42 0.54
Caire 2. 17 11 0 31 11 33 5.71 -2.30 7.88 0.47
Beyrouth 2. 16 50 0 31 11 11 5.43 -2.64 7.72 0.46
Khartoum 2. 17 23 0 29 11 45 6.14 -0.34 7.98 0.49
La Mecque 3. 17 48 0 29 11 9 5.81 -0.94 7.70 0.45
La Medina 3. 17 45 0 29 11 6 5.73 -1.34 7.67 0.45
Sanaa 3. 17 36 0 28 10 57 5.79 -0.03 7.61 0.44
Oman 2. 16 51 0 30 11 12 5.52 -2.40 7.72 0.46
Bagdad 3. 17 14 0 30 10 36 5.27 -2.29 7.45 0.42
Koweït 3. 17 5 0 29 10 27 5.36 -1.71 7.39 0.42
Teheran 3.5 17 13 0 29 10 5 5.01 -2.34 7.22 0.40
Istanbul 3. 18 5 0 32 11 27 5.09 -3.69 7.84 0.47
Jakarta 8. 18 45 0 15 7 6 3.13 3.41 6.02 0.28
Mexico -7.0 17 5 0 42 20 27 9.76 -4.22 12.31 1.16
Washington -5.0 17 12 0 43 18 34 7.10 -7.02 11.34 0.98
Montreal -5.0 16 48 0 42 18 9 6.11 -7.82 11.13 0.94
moon position in Tunis, at sunset on Monday 28 October -29 Safar 1441 Hijri

Figure 1: moon position in Tunis, at sunset on Monday 28 October -29 Safar 1441 Hijri

Lunar crescent visibility areas of Rabi’ al-awwal 1441 Hijri (according to Istanbul criteria) after sunset on Monday, October 28, 2019

Figure 2: Lunar crescent visibility areas of Rabi’ al-awwal 1441 Hijri (according to Istanbul criteria) after sunset on Monday, October 28, 2019

Abbreviation: 

lag: The period between sunset and moonset. (If the value is negative, in this case the moon sets before the sun).

Age Lune: The period between the conjunction and the sunset.

HL: Moon topocentric elevation (if the moon sets before the sun, the value will compensated by the symbol "*** ***").

DAZ: The difference between the sun’s azimuth and the moon’s azimuth, at sunset.

ARCL: Geocentric elongation between the sun and the moon.

W: The illuminated percentage of the moon's surface.

Indication : The criteria used to predict the visibility of the lunar crescent, are the Istanbul criteria (1978-2016).

The crescent Moon is visible after sunset, if the following conditions (criteria) are true.

  • The geocentric conjunction occurs before sunset.
  • HL> 5 ° at sunset.
  • ARCL> 8 °, at sunset.
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