"...You calculate the auspicious days, but you do not understand that the One Creator Lord is above these auspicious days..."

Hindu Astrology

Jyotisha is also known as Indian astrology, Hindu astrology, and Vedic astrology.
Jyotisha is the study of the planets, the stars, and the horizon. The word 'Jyotisha' can be translated as 'the science of light', or 'the wisdom of the heavens'. Hence, “Jyotish” provides the “light” to “see” much more deeply and clearly into the soul, into an individual’s past, present and future. Jyotisha is practiced by the Jyotishi and/or Pandit who explain the skies to the individual.

It is believed that each time a soul reincarnates, consciousness is brought into that lifetime. By observing the movements of the celestial bodies through time and space, the wisdom of the heavens can be applied to each incarnation to understand that souls path.

Hindu Astrology is used to acquire knowledge about each person's true character, talents, abilities and life patterns. Predictive Hindu astrology offers both specific details of and the precise timing for major life events. Planning and decision-making are done according to how the Pandit translates the meanings of the stars to the individual. 

Guru Granth Sahib Ji helps the reader to understand that knowing about the stars does not mean that they know everything about a person's future.

The stars which are seen in the sky - who is the painter who painted them?

Tell me, O Pandit, what is the sky attached to? Very fortunate is the knower who knows this. 

The sun and the moon give their light; God's creative extension extends everywhere. 

Says Kabeer, he alone knows this, whose heart is filled with the Lord, and whose mouth is also filled with the Lord.

Guru Granth Sahib Ji, page 329 

To read the horoscope of the mind, is the most sublime joyful peace. He alone is called a good Brahmin, who understands God in contemplative meditation.

He praises the Lord, and reads of the Lord, and contemplates the Word of the Guru's Shabad.

Celebrated and approved is the coming into the world of such a person, who saves all his generations as well. Hereafter, no one is questioned about social status; excellent and sublime is the practice of the Word of the Shabad.

Other study is false, and other actions are false; such people are in love with poison. They do not find any peace within themselves; the self-willed manmukhs waste away their lives.

O Nanak, those who are attuned to the Naam are saved; they have infinite love for the Guru. 

Guru Granth Sahib Ji, page 1093 

The Pandit may use knowledge about the stars to calculate days, but this does not warrant that they are right, as God is above these "calcualtions".  God is unknowing, and most mysterious.

You calculate the auspicious days, but you do not understand that the One Creator Lord is above these auspicious days.

He alone knows the way, who meets the Guru. When one follows the Guru's Teachings, then he realizes the Hukam of God's Command.

Do not tell lies, O Pandit; O religious scholar, speak the Truth. When egotism is eradicated through the Word of the Shabad, then one finds His home.  Calculating and counting, the astrologer draws the horoscope. He studies it and announces it, but he does not understand reality.

Understand, that the Word of the Guru's Shabad is above all. Do not speak of anything else; it is all just ashes.

You bathe, wash, and worship stones. But without being imbued with the Lord, you are the filthiest of the filthy. Subduing your pride, you shall receive the supreme wealth of God. The mortal is liberated and emancipated, meditating on the Lord.

You study the arguments, but do not contemplate the Vedas. You drown yourself - how will you save your ancestors? How rare is that person who realizes that God is in each and every heart. When one meets the True Guru, then he understands. 

Making his calculations, cynicism and suffering afflict his soul. Seeking the Sanctuary of the Guru, peace is found. I sinned and made mistakes, but now I seek Your Sanctuary. The Guru led me to meet the Lord, according to my past actions.

If one does not enter the Guru's Sanctuary, God cannot be found. Deluded by doubt, one is born, only to die, and come back again. Dying in corruption, he is bound and gagged at Death's door. The Naam, the Name of the Lord, is not in his heart, and he does not act according to the Shabad.

Some call themselves Pandits, religious scholars and spiritual teachers. Tinged with double-mindedness, they do not find the Mansion of the Lord's Presence. One who takes the Support of the Naam, by Guru's Grace, is a rare person, one among millions, incomparable.

One is bad, and another good, but the One True Lord is contained in all. Understand this, O spiritual teacher, through the support of the True Guru: rare indeed is that Gurmukh, who realizes the One Lord. His comings and goings cease, and he merges in the Lord.

Those who have the One Universal Creator Lord within their hearts, possess all virtues; they contemplate the True Lord. One who acts in harmony with the Guru's Will, O Nanak, is absorbed in the Truest of the True.

Guru Granth Sahib Ji, page 904