I though I share that as I am reading the PGM in translation, I cant help but to think how amazing it is that the art of Spirit Keeping has been with us since very old times. Going over the book, I stumbled on the very first papyri describing in details how they used to practice Spirit Keeping during the 2nd to 5th century BC to the 5th century AD (long period) and I thought:

1- How much more convenient is to have CH available! LOL
2-Towards the end of the spell description, I felt like I was reading one of the descriptions posted on etsy or bonanza by modern times conjures about their entities/spirits! (in context, of course)
3- It made me think of how in modern time people used to make a phone call before cell phones became available! LOL

Here is copy of the spell I am talking about: (from the PGM In Translation)
"Acquiring a Supernatural Assistant"

Pnouthios to Keryx, a god-fearing man, greetings. As one who knows, I have prescribed for you this spell for acquiring an assistant to prevent your failing as you carry out this rite. After detaching all the prescriptions bequeathed to us in countless books, one out of all I have shown you this spell for acquiring an assistant as one that is serviceable to you for you to take this holy assistant and only O friend of aerial spirits that move having persuaded me with god-given spells but not I have dispatched this book so that you may learn thoroughly. For the spell of Pnouthis has the power to persuade the gods and all the goddesses. And I shall write you from it about acquiring an assistant.
The traditional rite for acquiring an assistant:
After the preliminary purifications, abstain from animal food and from all uncleanliness and, on whatever night you want to, go up onto a lofty roof after you have clothed yourself in a pure garment and say the first spell of encounter as the sun's orb is disappearing with a wholly black Isis band on your eyes, and in your right hand / grasp a falcon's head and when the sun rises, hail it as you shake its head and recite this sacred spell as you burn uncut frankincense and pure rose oil, making the sacrifice in an earthen censer on ashes from the plant heliotrope. And as you recite the spell there will be this sign for you:
A falcon will fly down and stand in front of you, and after flapping its wings in mid-air and dropping an oblong stone, it will immediately take flight and ascend to heaven. You should pick up this stone; carve it at once and engrave it later. Once it has been engraved, bore a hole in it, pass a thread through and wear it around your neck.
But in the evening, go up to your housetop again and, facing the light of the goddess, address to her this hymnic spell as you again sacrifice myrrh troglitis in the same fashion. Light a fire and hold a branch of myrtle shaking it, and salute the goddess.
At once there will be a sign for you like this:
A blazing star will descend and come to a stop in the middle of the housetop, and when the star has dissolved before your eyes, you will behold the angel whom you have summoned and who has been sent to you, and you will quickly learn the decisions of the gods, but do not be afraid:
Approach the god and, taking his right hand, kiss him and say these words to the angel, for he will quickly respond to you about whatever you want. But you adjure him with this oath that he meet you and remain inseparable and that he not keep silent or disobey in any way. But when he has with certainty accepted this oath of yours, take the god by the hand and leap down, and after bringing him into the narrow room where you reside, sit him down. After first preparing the house in a fitting manner and providing all types of foods and Mendesian wine, set these before the god, with an uncorrupted boy serving and maintaining silence until the angel departs. And you address preliminary (?) words to the god;
"I shall have you as a friendly assistant, a beneficent god who serves me when- ever I say.
'Quickly, by your power now appear on earth to me, yea verily, god!"'
And while reclining, you yourself quickly speak about what you propose. Test this oath of the god on what you wish. But when 3 hours have passed, the god will immediately leap up. Order the boy to run to the door. And say, "Go, lord, blessed god, where you live eternally, as you will," and the god vanishes.
This is the sacred rite for acquiring an assistant. It is acknowledged that he is a god; he is an aerial spirit which you have seen. If you give him a command, straightway he performs the task: he sends dreams, he brings women, men without the use of magical material, he kills, he destroys, he stirs up winds from the earth, he carries / gold, silver, bronze, and he gives them to you whenever the need arises. And he frees from bonds a person chained in prison, he opens doors, he causes invisibility so that no one can see you at all, he is a bringer of fire, he brings water, wine, bread and [whatever] you wish in the way of foods: olive oil, vinegar — with the single exception of fish—and he will bring plenty of vegetables, whatever kind you wish, but as for pork, you must not ever tell him to bring this at all! And when you want to give a dinner, tell him so.
Conjure up in your mind any suitable room and order him to prepare it for a banquet quickly and without delay. At once he will bestow chambers with golden ceilings, and you will see their walls covered with marble — and you consider these things partly real and partly just illusionary — and costly wine, as is meet to cap a dinner splendidly.
He will quickly bring daimons, and for you he will adorn these servants with sashes. These things he does quickly. And as soon as you order him to perform a service, he will do so, and you will see him excelling in other things: He stops ships and again releases them, he stops very many evil daimons, he checks wild beasts and will quickly break the teeth of fierce reptiles, he puts dogs to sleep and renders them voiceless. He changes into whatever form of beast you want: one that flies, swims, a quadruped,
a reptile. He will carry you into the air, and again hurl you into the billows of the sea's current and into the waves of the sea; he will quickly freeze rivers and seas and in such a way that you can run over them firmly, as you want.
And especially will he stop, if ever you wish it, the sea-runnning foam, and whenever you wish to bring down stars and whenever you wish to make warm things cold and cold things warm, he will light lamps and extinguish them again. And he will shake walls and [cause] them to blaze with fire; he will serve you suitably for whatever you have in mind, O blessed initiate of the sacred magic, and will accomplish it for you, this most powerful assistant, who is also the only lord of the air. And the gods will agree to everything, for without him nothing happens. Share this great mystery with no one else, but conceal it, by Helios, since you have been deemed worthy by the lord god.
And this is spoken next:
"Hither to me. King, God of Gods, might, boundless, undefiled, indescribably, firmly established Aion. Be inseparable from me from this day forth through all the time of my life."

Then question him by the same oaths. If he tells you his name, take him by the hand, descend and have him recline as I have said above, setting before him part of the foods and drinks which you partake of. And when you release him, sacrifice to him after his departure what is prescribed and pour a wine offering, and in this way you will be a friend of the mighty angel. When you go abroad, he will go abroad with you; when you are destitute, he will give you money. He will tell you what things will happen both when and at what time of the night or day. And if anyone asks you "What do I have in mind?" or "What has happened to me?" or even "What is going to happen?," question the angel, and he will tell you in silence.
But you speak to the one who questions you as if from yourself. When you are dead, he will wrap up your body as befits a god, but he will take your spirit and carry it into the air with him. For no aerial spirit which is joined with a mighty assistant will go into Hades, for to him all things are subject. Whenever you wish to do something, speak his name alone into the air and say, "Come!" and you will see him actually standing near you. And say to him, "Perform this task," and he does it at once, and after doing it he will say to you, "What else do you want? For I am eager for heaven," If you do not have immediate orders, say to him, "Go, lord," and he will depart. In this fashion, then, the god will be seen by you alone, nor will anyone ever hear the sound of his speaking, just you yourself alone. And he will tell you about the illness of a man, whether he will live or die, even on what day and at what hour of night. And he will also give you both wild herbs and the power to cure, and you will be worshiped as a god since you have a god as a friend.
These things the mighty assistant will perform competently. Therefore share these things with no one except your legitimate son alone when he asks you for the magic powers imparted by us. Farewell.

The address to the sun / requires nothing except the formula
"lAEOBAPHRENEMOUN" and the formula "lARBATHA."

Fascinating.