A solar halo (a ring of light surrounding the sun), the physical
 manifestation of the glory of the Church.
Photo: univision

Halo (an optical phenomenon) is a ring of light, the crowning glory on all the works of God's people on earth.

Here is the Merriam-Webster definition of Halo:
A circle of light appearing to surround the sun or moon and resulting from refraction or reflection of light by ice particles in the atmosphere.

Compare the Merriam-Webster definition with the following Oxford Living Dictionaries definition of Halo:
A circle of light shown around or above the head of a saint or a holy person to represent their holiness.

The deduction from the two definitions of halo above is that halo is a circle (a ring) of light. The first definition of halo is that the circle of light revolves around the sun or the moon; sun implies Christianity and moon implies Islam.

How is Christianity synonymous with the sun? God described the Christians as children of the day:
All of you are people who belong to the light, who belong to the day. We do not belong to the night or to the darkness. (1 Thessalonians 5:5) "GNT"

We know that sunlight is the light of the day; therefore Christians who are assigned to the day constitute the category of God's people shining as sunlight.

Like Christianity is synonymous with the cross so Islam is synonymous with the crescent. The crescent symbolises the moonlight; therefore the Muslims constitute the category of God's people shining as moonlight.

The sun, the moon, and the stars are the lights God created in the beginning:
Then God commanded, Let lights appear in the sky to separate day from night and to show the time when days, years, and religious festivals begin; (Genesis 1:14)

We are now aware that sunlight is Christianity and moonlight is Islam. What we don't know is the identity of the body of stars.

The hexagram known as the Star of David symbolises the stars in space. Since the hexagram or the star of David is the rallying point of the Jewish State of Israel, the hexagram (the star) symbolises Judaism.

How is the hexagram the rallying point of the Jews? The Jews are a nation united by the flag of Israel which has the hexagram (the star of David) at its core.

Sunlight = Christianity
Moonlight = Islam
Star = Judaism

Therefore Christians, Muslims, and Jews are the lights God created and placed in the sky to give light to the earth,
They will shine in the sky to give light to the earth. (Genesis 1:15) "GNT"

Christianity is the brightest of the three lights, Islam is the brighter light, and Judaism is the least bright of the three lights. Therefore Christianity dominates both the night and the day, and Islam dominates only the night. Christianity dominating the day is sunlight.

No other light is visible in the sky during the day because of the dazzling brightness of the sunlight. Though the moon and the stars are in the sky during day time, they are invisible because of the dazzling light of the sun.

The moon does not generate its own light; moonlight is a reflection of sunlight. The moon reflects sunlight and lights up the night; and the sun rules the night through the moon.

Since moonlight is Islam and sunlight is Christianity, Muslims rule the night by reflecting Christianity. God created Christianity and Islam to rule the day and the night respectively,
God made the two larger lights, the sun to rule over the day and the moon to rule over the night; he also made the stars. (Genesis 1:16) "GNT"

The sun to rule over the day: the Church (Christians) to rule over the day.

This means that Christian rule begins from sunrise to sunset - a period of twelve hours.

The moon to rule over the night: the Mosque (Muslims) to rule over the night.

This means that Muslim rule begins from sunset to sunrise.

Christianity is twelve hours of the twenty four hours constituting a day. The remaining twelve hours in the twenty four hours constitute Islam. Therefore "the sun to rule over the day and the moon to rule over the night" is rephrased as "the Church (the Christians) and the Mosque (the Muslims) to rule over the twenty four hours in every day.

He also made the stars: the synagogue (the Jews) was also created.

Sunrise to sunset constitute a period of 12 hours, equal to a full circle round the clock. The circle is the circle of light surrounding the sun. Therefore the definition of halo as a circle of light round the sun is simply a description of the light of Christianity.

Since halo is a circle of light surrounding the sun or the moon, every twenty four hour circle is a halo made up of Islam and Christianity. And since a day is equal to a period of twenty four hours, everyday is a halo or a circle of light. The twenty four hours in this circle of light are the twenty four thrones of the twenty four elders,
In a circle round the throne were twenty-four other thrones, on which were seated twenty-four elders. (Revelation 4:4) "GNT"

Since Christians and Muslims constitute a period of twenty four hours, the twenty four elders are simply the Christians and the Muslims.
24 Thrones = 24 Hours

Christians constitute twelve elders sitting on the twelve hours starting from sunrise to sunset and manifesting as a solar halo; Muslims constitute twelve elders sitting on the twelve hours starting from sunset to sunrise and manifesting as a lunar halo. The 12 Muslims elders are the 12 Imams, and the Muslims constitute the 12 Imams sitting round the moonlight. The 12 Imams or the Muslims constitute the halo or circle of light surrounding the moon. The twelve Christian elders are the twelve Disciple of Jesus, and the Christians constitute the 12 Disciples sitting round the sun. The 12 Disciples or the Christians constitute the halo or circle of light surrounding the sun.

A day is a ring of light formed by the sum of the halo formed by the 12 Imams and the halo formed by the twelve Disciples. The sum of Islam and Christianity is equal to the aligning of the moon and the sun to form an annular solar eclipse. The annular solar eclipse is the ring of light or the solar eclipse halo; therefore the first definition of halo above is the definition of an annular solar eclipse, a day (24 Hours), and the point where Islam and Christianity are reconciled (aligned).

This means that the 'ring of light' reconciles Islam with Christianity. It is a symbol of unity between Muslims and Christians. It is a sign of peace, love, and religious harmony. The 'ring of light' is the halo crowning the Saints and depicting a holy person.

Neither the light of Christianity nor the light of Islam is as bright as the 'ring of light'. This is the eternal light where God dwells.
No longer will the sun be your light by day or the moon be your light by night; I, the LORD, will be your eternal light; (Isaiah 60:19) "GNT"